- •Features
- •Pin Configurations
- •Disclaimer
- •Overview
- •Block Diagram
- •Pin Descriptions
- •Port B (PB5..PB0)
- •RESET
- •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
- •Clock Systems and their Distribution
- •CPU Clock – clkCPU
- •I/O Clock – clkI/O
- •Flash Clock – clkFLASH
- •ADC Clock – clkADC
- •Clock Sources
- •Default Clock Source
- •External Clock
- •System Clock Prescaler
- •Switching Time
- •Idle Mode
- •Power-down Mode
- •Analog to Digital Converter
- •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
- •Timed Sequences for Changing the Configuration of the Watchdog Timer
- •Safety Level 1
- •Safety Level 2
- •Interrupts
- •I/O Ports
- •Introduction
- •Configuring the Pin
- •Toggling the Pin
- •Reading the Pin Value
- •Unconnected Pins
- •Alternate Port Functions
- •Alternate Functions of Port B
- •Register Description for I/O-Ports
- •Port B Data Register – PORTB
- •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
- •Prescaler Reset
- •External Clock Source
- •Analog Comparator
- •Analog Comparator Multiplexed Input
- •Features
- •Operation
- •Starting a Conversion
- •Changing Channel or Reference Selection
- •ADC Input Channels
- •ADC Voltage Reference
- •ADC Noise Canceler
- •Analog Input Circuitry
- •ADC Accuracy Definitions
- •ADC Conversion Result
- •ADLAR = 0
- •ADLAR = 1
- •debugWIRE On-chip Debug System
- •Features
- •Overview
- •Physical Interface
- •Software Break Points
- •Limitations of debugWIRE
- •debugWIRE Related Register in I/O Memory
- •debugWire Data Register – DWDR
- •Performing a Page Write
- •Reading the Fuse and Lock Bits from Software
- •Preventing Flash Corruption
- •Fuse Bytes
- •Latching of Fuses
- •Signature Bytes
- •Calibration Byte
- •Page Size
- •Serial Downloading
- •Data Polling Flash
- •Data Polling EEPROM
- •Chip Erase
- •Programming the Flash
- •Programming the EEPROM
- •Reading the Flash
- •Reading the EEPROM
- •Power-off sequence
- •Electrical Characteristics
- •Absolute Maximum Ratings*
- •External Clock Drive Waveforms
- •External Clock Drive
- •ADC Characteristics – Preliminary Data
- •Active Supply Current
- •Idle Supply Current
- •Power-down Supply Current
- •Pin Pull-up
- •Register Summary
- •Instruction Set Summary
- •Ordering Information
- •Packaging Information
- •Erratas
- •Table of Contents
ATtiny13
The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to
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ten times faster than conventional CISC microcontrollers. |
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The ATtiny13 provides the following features: 1K byte of In-System Programmable |
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Flash, 64 bytes EEPROM, 64 bytes SRAM, 6 general purpose I/O lines, 32 general pur- |
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pose working registers, one 8-bit Timer/Counter with compare modes, Internal and |
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External Interrupts, a 4-channel, 10-bit ADC, a programmable Watchdog Timer with |
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internal Oscillator, and three software selectable power saving modes. The Idle mode |
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stops the CPU while allowing the SRAM, Timer/Counter, ADC, Analog Comparator, and |
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Interrupt system to continue functioning. The Power-down mode saves the register con- |
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tents, disabling all chip functions until the next Interrupt or Hardware Reset. The ADC |
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Noise Reduction mode stops the CPU and all I/O modules except ADC, to minimize |
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switching noise during ADC conversions. |
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The device is manufactured using Atmel’s high density non-volatile memory technology. |
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The On-chip ISP Flash allows the Program memory to be re-programmed In-System |
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through an SPI serial interface, by a conventional non-volatile memory programmer or |
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by an On-chip boot code running on the AVR core. |
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The ATtiny13 AVR is supported with a full suite of program and system development |
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tools including: C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Cir- |
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cuit Emulators, and Evaluation kits. |
Pin Descriptions |
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VCC |
Digital supply voltage. |
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GND |
Ground. |
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Port B (PB5..PB0) |
Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each |
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bit). The Port B output buffers have symmetrical drive characteristics with both high sink |
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and source capability. As inputs, Port B pins that are externally pulled low will source |
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current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset |
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condition becomes active, even if the clock is not running. |
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Port B also serves the functions of various special features of the ATtiny13 as listed on |
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page 48. |
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Reset input. A low level on this pin for longer than the minimum pulse length will gener- |
RESET |
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ate a reset, even if the clock is not running. The minimum pulse length is given in Table |
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12 on page 30. Shorter pulses are not guaranteed to generate a reset. |
About Code
Examples
This documentation contains simple code examples that briefly show how to use various parts of the device. These code examples assume that the part specific header file is included before compilation. Be aware that not all C compiler vendors include bit definitions in the header files and interrupt handling in C is compiler dependent. Please confirm with the C compiler documentation for more details.
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