ATtiny261/461/861
22.5Page Size
Table 22-7. |
No. of Words in a Page and No. of Pages in the Flash |
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Flash Size |
Page Size |
PCWORD |
No. of Pages |
PCPAGE |
PCMSB |
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ATtiny261 |
1K words (2K bytes) |
16 words |
PC[3:0] |
64 |
PC[9:4] |
9 |
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ATtiny461 |
2K words (4K bytes) |
32 words |
PC[4:0] |
64 |
PC[10:5] |
10 |
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ATtiny861 |
4K words (8K bytes) |
32 words |
PC[4:0] |
128 |
PC[11:5] |
11 |
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Table 22-8. |
No. of Words in a Page and No. of Pages in the EEPROM |
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EEPROM |
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Device |
Size |
Page Size |
PCWORD |
No. of Pages |
PCPAGE |
EEAMSB |
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ATtiny261 |
128 bytes |
4 bytes |
EEA[1:0] |
64 |
EEA[6:2] |
6 |
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ATtiny461 |
256 bytes |
4 bytes |
EEA[1:0] |
64 |
EEA[7:2] |
7 |
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ATtiny861 |
512 bytes |
4 bytes |
EEA[1:0] |
128 |
EEA[8:2] |
8 |
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22.6Parallel Programming Parameters, Pin Mapping, and Commands
This section describes how to parallel program and verify Flash Program memory, EEPROM Data memory, Memory Lock bits, and Fuse bits in the ATtiny261/461/861. Pulses are assumed to be at least 250 ns unless otherwise noted.
22.6.1Signal Names
In this section, some pins of the ATtiny261/461/861 are referenced by signal names describing their functionality during parallel programming, see Figure 22-1 and Table 22-9. Pins not described in the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in Table 22-11.
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in Table 22-12.
171
2588B–AVR–11/06
Figure 22-1. Parallel Programming
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+5V |
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WR |
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PB0 |
VCC |
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XA0 |
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PB1 |
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+5V |
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AVCC |
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XA1/BS2 |
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PB2 |
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DATA |
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PA7 - PA0 |
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PAGEL/BS1 |
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PB3 |
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XTAL1/PB4
OE 
PB5
RDY/BSY 
PB6
+12 V 
RESET GND
Table 22-9. Pin Name Mapping
Signal Name in |
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Programming Mode |
Name |
I/O |
Function |
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PB0 |
I |
Write Pulse (Active low). |
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WR |
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XA0 |
PB1 |
I |
XTAL Action Bit 0 |
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XA1/BS2 |
PB2 |
I |
XTAL Action Bit 1. Byte Select 2 (“0” selects low byte, “1” |
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selects 2’nd high byte). |
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PAGEL/BS1 |
PB3 |
I |
Byte Select 1 (“0” selects low byte, “1” selects high byte). |
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Program Memory and EEPROM Data Page Load. |
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PB5 |
I |
Output Enable (Active low). |
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OE |
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0: Device is busy programming, 1: Device is ready for new |
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RDY/BSY |
PB6 |
O |
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command. |
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DATA I/O |
PA7-PA0 |
I/O |
Bi-directional Data bus (Output when |
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OE |
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Table 22-10. Pin Values Used to Enter Programming Mode
Pin |
Symbol |
Value |
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PAGEL/BS1 |
Prog_enable[3] |
0 |
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XA1/BS2 |
Prog_enable[2] |
0 |
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XA0 |
Prog_enable[1] |
0 |
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WR |
Prog_enable[0] |
0 |
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172 ATtiny261/461/861 
2588B–AVR–11/06