- •Features
- •Pin Configurations
- •Overview
- •Block Diagram
- •Pin Descriptions
- •Port A (PA2..PA0)
- •Port B (PB7..PB0)
- •Port D (PD6..PD0)
- •RESET
- •XTAL1
- •XTAL2
- •Disclaimer
- •AVR CPU Core
- •Introduction
- •Architectural Overview
- •Status Register
- •Stack Pointer
- •Interrupt Response Time
- •SRAM Data Memory
- •Data Memory Access Times
- •EEPROM Data Memory
- •EEPROM Read/Write Access
- •Atomic Byte Programming
- •Split Byte Programming
- •Erase
- •Write
- •I/O Memory
- •General Purpose I/O Registers
- •Clock Systems and their Distribution
- •Clock Sources
- •Default Clock Source
- •Crystal Oscillator
- •External Clock
- •Idle Mode
- •Power-down Mode
- •Standby Mode
- •Analog Comparator
- •Brown-out Detector
- •Internal Voltage Reference
- •Watchdog Timer
- •Port Pins
- •Resetting the AVR
- •Reset Sources
- •Power-on Reset
- •External Reset
- •Brown-out Detection
- •Watchdog Reset
- •Watchdog Timer
- •Interrupts
- •I/O-Ports
- •Introduction
- •Configuring the Pin
- •Toggling the Pin
- •Reading the Pin Value
- •Alternate Port Functions
- •Alternate Functions of Port A
- •Alternate Functions of Port B
- •Alternate Functions of Port D
- •Register Description for I/O-Ports
- •External Interrupts
- •8-bit Timer/Counter0 with PWM
- •Overview
- •Registers
- •Definitions
- •Counter Unit
- •Output Compare Unit
- •Force Output Compare
- •Modes of Operation
- •Normal Mode
- •Fast PWM Mode
- •Phase Correct PWM Mode
- •Internal Clock Source
- •Prescaler Reset
- •External Clock Source
- •16-bit Timer/Counter1
- •Overview
- •Registers
- •Definitions
- •Compatibility
- •Counter Unit
- •Input Capture Unit
- •Input Capture Trigger Source
- •Noise Canceler
- •Using the Input Capture Unit
- •Output Compare Units
- •Force Output Compare
- •Modes of Operation
- •Normal Mode
- •Fast PWM Mode
- •Phase Correct PWM Mode
- •USART
- •Overview
- •Clock Generation
- •External Clock
- •Synchronous Clock Operation
- •Frame Formats
- •Parity Bit Calculation
- •USART Initialization
- •Sending Frames with 5 to 8 Data Bit
- •Sending Frames with 9 Data Bit
- •Parity Generator
- •Disabling the Transmitter
- •Receiving Frames with 5 to 8 Data Bits
- •Receiving Frames with 9 Data Bits
- •Receiver Error Flags
- •Parity Checker
- •Disabling the Receiver
- •Flushing the Receive Buffer
- •Asynchronous Data Recovery
- •Using MPCM
- •Overview
- •Functional Descriptions
- •Three-wire Mode
- •SPI Slave Operation Example
- •Two-wire Mode
- •Start Condition Detector
- •Alternative USI Usage
- •4-bit Counter
- •12-bit Timer/Counter
- •Software Interrupt
- •Analog Comparator
- •debugWIRE On-chip Debug System
- •Features
- •Overview
- •Physical Interface
- •Software Break Points
- •Limitations of debugWIRE
- •debugWIRE Related Register in I/O Memory
- •Performing a Page Write
- •Reading the Fuse and Lock Bits from Software
- •Preventing Flash Corruption
- •Fuse Bits
- •Latching of Fuses
- •Signature Bytes
- •Calibration Byte
- •Page Size
- •Signal Names
- •Parallel Programming
- •Enter Programming Mode
- •Chip Erase
- •Programming the Flash
- •Programming the EEPROM
- •Reading the Flash
- •Reading the EEPROM
- •Programming the Lock Bits
- •Reading the Signature Bytes
- •Reading the Calibration Byte
- •Serial Downloading
- •Electrical Characteristics
- •Absolute Maximum Ratings*
- •DC Characteristics
- •External Clock Drive Waveforms
- •External Clock Drive
- •Active Supply Current
- •Idle Supply Current
- •Power-down Supply Current
- •Standby Supply Current
- •Pin Pull-up
- •Pin Driver Strength
- •Internal Oscillator Speed
- •Register Summary
- •Instruction Set Summary
- •Ordering Information
- •Packaging Information
- •Errata
- •ATtiny2313 Rev B
- •ATtiny2313 Rev A
- •Changes from Rev. 2514F-08/04 to Rev. 2514G-10/04
- •Changes from Rev. 2514F-08/04 to Rev. 2514G-10/04
- •Changes from Rev. 2514E-04/04 to Rev. 2514F-08/04
- •Changes from Rev. 2514D-03/04 to Rev. 2514E-04/04
- •Changes from Rev. 2514C-12/03 to Rev. 2514D-03/04
- •Changes from Rev. 2514B-09/03 to Rev. 2514C-12/03
- •Changes from Rev. 2514A-09/03 to Rev. 2514B-09/03
- •Table of Contents
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ATtiny2313/V |
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Serial Programming Pin |
Table 75. Pin Mapping Serial Programming |
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Mapping |
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Symbol |
Pins |
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I/O |
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Description |
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MOSI |
PB5 |
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Serial Data in |
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MISO |
PB6 |
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Serial Data out |
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SCK |
PB7 |
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Serial Clock |
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Parallel Programming
Enter Programming Mode |
The following algorithm puts the device in Parallel programming mode: |
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1. |
Set Prog_enable pins listed in Table 72 on page 162 to “0000”, RESET pin VCC |
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to 0V. |
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2. |
Apply 4.5 - 5.5V between VCC and GND. |
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3. |
Ensure that VCC reaches at least 1.8V within the next 20 µs. |
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4. |
Wait 20 - 60 µs, and apply 11.5 - 12.5V to RESET. |
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Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage |
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has been applied to ensure the Prog_enable Signature has been latched. |
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6. |
Wait at least 300 µs before giving any parallel programming commands. |
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7. |
Exit Programming mode by power the device down or by bringing RESET pin to |
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0V. |
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If the rise time of the VCC is unable to fulfill the requirements listed above, the following |
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alternative algorithm can be used. |
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1. |
Set Prog_enable pins listed in Table 72 on page 162 to “0000”, RESET pin to 0V |
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and VCC to 0V. |
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Apply 4.5 - 5.5V between VCC and GND. |
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3. |
Monitor VCC, and as soon as VCC reaches 0.9 - 1.1V, apply 11.5 - 12.5V to |
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RESET. |
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4. |
Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage |
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has been applied to ensure the Prog_enable Signature has been latched. |
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5. |
Wait until VCC actually reaches 4.5 -5.5V before giving any parallel programming |
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commands. |
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6. |
Exit Programming mode by power the device down or by bringing RESET pin to |
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0V. |
Considerations for Efficient |
The loaded command and address are retained in the device during programming. For |
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Programming |
efficient programming, the following should be considered. |
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• |
The command needs only be loaded once when writing or reading multiple memory |
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locations. |
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Skip writing the data value 0xFF, that is the contents of the entire EEPROM (unless |
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the EESAVE Fuse is programmed) and Flash after a Chip Erase. |
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Address high byte needs only be loaded before programming or reading a new 256 |
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word window in Flash or 256 byte EEPROM. This consideration also applies to |
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Signature bytes reading. |
Chip Erase |
The Chip Erase will erase the Flash and EEPROM(1) memories plus Lock bits. The Lock |
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bits are not reset until the program memory has been completely erased. The Fuse bits |
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2543H–AVR–02/05
are not changed. A Chip Erase must be performed before the Flash and/or EEPROM are reprogrammed.
Note: 1. The EEPRPOM memory is preserved during Chip Erase if the EESAVE Fuse is programmed.
Load Command “Chip Erase”
1.Set XA1, XA0 to “10”. This enables command loading.
2.Set BS1 to “0”.
3.Set DATA to “1000 0000”. This is the command for Chip Erase.
4.Give XTAL1 a positive pulse. This loads the command.
5.Give WR a negative pulse. This starts the Chip Erase. RDY/BSY goes low.
6.Wait until RDY/BSY goes high before loading a new command.
164 ATtiny2313/V
2543H–AVR–02/05
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ATtiny2313/V |
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Programming the Flash |
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The Flash is organized in pages, see Table 69 on page 160. When programming the |
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Flash, the program data is latched into a page buffer. This allows one page of program |
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data to be programmed simultaneously. The following procedure describes how to pro- |
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gram the entire Flash memory: |
A. Load Command “Write Flash”
1.Set XA1, XA0 to “10”. This enables command loading.
2.Set BS1 to “0”.
3.Set DATA to “0001 0000”. This is the command for Write Flash.
4.Give XTAL1 a positive pulse. This loads the command.
B. Load Address Low byte
1.Set XA1, XA0 to “00”. This enables address loading.
2.Set BS1 to “0”. This selects low address.
3.Set DATA = Address low byte (0x00 - 0xFF).
4.Give XTAL1 a positive pulse. This loads the address low byte.
C. Load Data Low Byte
1.Set XA1, XA0 to “01”. This enables data loading.
2.Set DATA = Data low byte (0x00 - 0xFF).
3.Give XTAL1 a positive pulse. This loads the data byte.
D. Load Data High Byte
1.Set BS1 to “1”. This selects high data byte.
2.Set XA1, XA0 to “01”. This enables data loading.
3.Set DATA = Data high byte (0x00 - 0xFF).
4.Give XTAL1 a positive pulse. This loads the data byte.
E. Repeat B through E until the entire buffer is filled or until all data within the page is loaded.
While the lower bits in the address are mapped to words within the page, the higher bits address the pages within the FLASH. This is illustrated in Figure 70 on page 166. Note that if less than eight bits are required to address words in the page (pagesize < 256), the most significant bit(s) in the address low byte are used to address the page when performing a Page Write.
F. Load Address High byte
1.Set XA1, XA0 to “00”. This enables address loading.
2.Set BS1 to “1”. This selects high address.
3.Set DATA = Address high byte (0x00 - 0xFF).
4.Give XTAL1 a positive pulse. This loads the address high byte.
G. Program Page
1.Give WR a negative pulse. This starts programming of the entire page of data. RDY/BSY goes low.
2.Wait until RDY/BSY goes high (See Figure 71 for signal waveforms).
H.Repeat B through H until the entire Flash is programmed or until all data has been programmed.
I.End Page Programming
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2543H–AVR–02/05
1.1. Set XA1, XA0 to “10”. This enables command loading.
2.Set DATA to “0000 0000”. This is the command for No Operation.
3.Give XTAL1 a positive pulse. This loads the command, and the internal write signals are reset.
Figure 70. Addressing the Flash Which is Organized in Pages(1)
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PROGRAM |
PCMSB |
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PAGEMSB |
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PCPAGE |
PCWORD |
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COUNTER |
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PAGE ADDRESS |
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WORD ADDRESS |
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WITHIN THE FLASH |
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WITHIN A PAGE |
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PROGRAM MEMORY |
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PAGE |
PCWORD[PAGEMSB:0]: |
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PAGE |
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INSTRUCTION WORD |
00 |
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01 |
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02 |
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PAGEEND
Note: 1. PCPAGE and PCWORD are listed in Table 69 on page 160.
Figure 71. Programming the Flash Waveforms(1)
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F |
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A |
B |
C |
D |
E |
B |
C |
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E |
G |
H |
DATA |
0x10 |
ADDR. LOW |
DATA LOW |
DATA HIGH |
XX |
ADDR. LOW |
DATA LOW |
DATA HIGH |
XX |
ADDR. HIGH |
XX |
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XA1 |
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XA0 |
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BS1 |
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XTAL1 |
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WR |
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RDY/BSY |
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RESET +12V |
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OE |
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PAGEL |
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BS2 |
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Note: 1. “XX” is don’t care. The letters refer to the programming description above.
166 ATtiny2313/V
2543H–AVR–02/05