Data Sheet

299
8161D–AVR–10/09
ATmega48PA/88PA/168PA/328P
this byte is automatically written into the OSCCAL Register to ensure correct frequency of the
calibrated RC Oscillator.
27.5 Page Size
27.6 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 ATmega48PA/88PA/168PA/328P. Pulses
are assumed to be at least 250 ns unless otherwise noted.
27.6.1 Signal Names
In this section, some pins of the ATmega48PA/88PA/168PA/328P are referenced by signal
names describing their functionality during parallel programming, see Figure 27-1 and Table 27-
13. 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 27-15.
When pulsing WR
or OE, the command loaded determines the action executed. The different
Commands are shown in Table 27-16.
Table 27-11. No. of Words in a Page and No. of Pages in the Flash
Device Flash Size Page Size PCWORD
No. of
Pages PCPAGE PCMSB
ATmega48PA
2K words
(4K bytes)
32 words PC[4:0] 64 PC[10:5] 10
ATmega88PA
4K words
(8K bytes)
32 words PC[4:0] 128 PC[11:5] 11
ATmega168PA
8K words
(16K bytes)
64 words PC[5:0] 128 PC[12:6] 12
ATmega328P
16K words
(32K bytes)
64 words PC[5:0] 256 PC[13:6] 13
Table 27-12. No. of Words in a Page and No. of Pages in the EEPROM
Device
EEPROM
Size
Page
Size PCWORD
No. of
Pages PCPAGE EEAMSB
ATmega48PA 256 bytes 4 bytes EEA[1:0] 64 EEA[7:2] 7
ATmega88PA 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8
ATmega168PA 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8
ATmega328P 1K bytes 4 bytes EEA[1:0] 256 EEA[9:2] 9