299
8025I–AVR–02/09
ATmega48P/88P/168P/328P
25.4 Calibration Byte
The ATmega48P/88P/168P/328P has a byte calibration value for the Internal RC Oscillator. This
byte resides in the high byte of address 0x000 in the signature address space. During reset, this
byte is automatically written into the OSCCAL Register to ensure correct frequency of the cali-
brated RC Oscillator.
25.5 Page Size
25.6 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/328P. Pulses are
assumed to be at least 250 ns unless otherwise noted.
25.6.1 Signal Names
In this section, some pins of the ATmega48P/88P/168P/328P are referenced by signal names
describing their functionality during parallel programming, see Figure 25-1 and Table 25-13.
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 25-15.
When pulsing WR
or OE, the command loaded determines the action executed. The different
Commands are shown in Table 25-16.
Table 25-11. No. of Words in a Page and No. of Pages in the Flash
Device Flash Size Page Size PCWORD
No. of
Pages PCPAGE PCMSB
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
ATmega328P
16K words
(32K bytes)
64 words PC[5:0] 256 PC[13:6] 13
Table 25-12. No. of Words in a Page and No. of Pages in the EEPROM
Device
EEPROM
Size
Page
Size PCWORD
No. of
Pages PCPAGE EEAMSB
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
ATmega328P 1K bytes 4 bytes EEA[1:0] 256 EEA[9:2] 9
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