Datasheet

295
8025M–AVR–6/11
ATmega48P/88P/168P
28.5 Page Size
28.6 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 ATmega48P/88P/168P. Pulses are
assumed to be at least 250 ns unless otherwise noted.
28.6.1 Signal Names
In this section, some pins of the ATmega48P/88P/168P are referenced by signal names describ-
ing their functionality during parallel programming, see Figure 28-1 and Table 28-11. 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 28-13.
When pulsing WR
or OE, the command loaded determines the action executed. The different
Commands are shown in Table 28-14.
Table 28-9. No. of Words in a Page and No. of Pages in the Flash
Device Flash Size Page Size PCWORD
No. of
Pages PCPAGE PCMSB
ATmega48P
2K words
(4K bytes)
32 words PC[4:0] 64 PC[10:5] 10
ATmega88P
4K words
(8K bytes)
32 words PC[4:0] 128 PC[11:5] 11
ATmega168P
8K words
(16K bytes)
64 words PC[5:0] 128 PC[12:6] 12
Table 28-10. No. of Words in a Page and No. of Pages in the EEPROM
Device
EEPROM
Size
Page
Size PCWORD
No. of
Pages PCPAGE EEAMSB
ATmega48P 256 bytes 4 bytes EEA[1:0] 64 EEA[7:2] 7
ATmega88P 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8
ATmega168P 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8