Rainbow Electronics ATtiny861_V - Manual (Page 171)

171
2588B–AVR–11/06
ATtiny261/461/861
22.5 Page Size
22.6 Parallel 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.
22.6.1 Signal 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 .
Table 22-7. No. of Words in a Page and No. of Pages in the Flash
Device Flash Size Page Size PCWORD No. of Pages PCPAGE PCMSB
ATtiny261 1K words (2K bytes) 16 words PC[3:0] 64 PC[9:4] 9
ATtiny461 2K words (4K bytes) 32 words PC[4:0] 64 PC[10:5] 10
ATtiny861 4K words (8K bytes) 32 words PC[4:0] 128 PC[11:5] 11
Table 22-8. No. of Words in a Page and No. of Pages in the EEPROM
Device
EEPROM
Size Page Size PCWORD No. of Pages PCPAGE EEAMSB
ATtiny261 128 bytes 4 bytes EEA[1:0] 64 EEA[6:2] 6
ATtiny461 256 bytes 4 bytes EEA[1:0] 64 EEA[7:2] 7
ATtiny861 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8