ATmega48PA/88PA/168PA/328P
27.8.1
Serial Programming Pin Mapping
Table 27-17. Pin Mapping Serial Programming
Symbol
MOSI
MISO
SCK
Pins
PB3
PB4
PB5
I/O
Description
Serial Data in
Serial Data out
Serial Clock
I
O
I
27.8.2
Serial Programming Algorithm
When writing serial data to the ATmega48PA/88PA/168PA/328P, data is clocked on the rising
edge of SCK.
When reading data from the ATmega48PA/88PA/168PA/328P, data is clocked on the falling
edge of SCK. See Figure 27-9 for timing details.
To program and verify the ATmega48PA/88PA/168PA/328P in the serial programming mode,
the following sequence is recommended (See Serial Programming Instruction set in Table 27-19
on page 310):
1. Power-up sequence:
Apply power between VCC and GND while RESET and SCK are set to “0”. In some sys-
tems, the programmer can not guarantee that SCK is held low during power-up. In this
case, RESET must be given a positive pulse of at least two CPU clock cycles duration
after SCK has been set to “0”.
2. Wait for at least 20 ms and enable serial programming by sending the Programming
Enable serial instruction to pin MOSI.
3. The serial programming instructions will not work if the communication is out of synchro-
nization. When in sync. the second byte (0x53), will echo back when issuing the third
byte of the Programming Enable instruction. Whether the echo is correct or not, all four
bytes of the instruction must be transmitted. If the 0x53 did not echo back, give RESET a
positive pulse and issue a new Programming Enable command.
4. The Flash is programmed one page at a time. The memory page is loaded one byte at a
time by supplying the 6 LSB of the address and data together with the Load Program
Memory Page instruction. To ensure correct loading of the page, the data low byte must
be loaded before data high byte is applied for a given address. The Program Memory
Page is stored by loading the Write Program Memory Page instruction with the 7 MSB of
the address. If polling (RDY/BSY) is not used, the user must wait at least tWD_FLASH before
issuing the next page (See Table 27-18). Accessing the serial programming interface
before the Flash write operation completes can result in incorrect programming.
5. A: The EEPROM array is programmed one byte at a time by supplying the address and
data together with the appropriate Write instruction. An EEPROM memory location is first
automatically erased before new data is written. If polling (RDY/BSY) is not used, the
user must wait at least tWD_EEPROM before issuing the next byte (See Table 27-18). In a
chip erased device, no 0xFFs in the data file(s) need to be programmed.
B: The EEPROM array is programmed one page at a time. The Memory page is loaded
one byte at a time by supplying the 6 LSB of the address and data together with the Load
EEPROM Memory Page instruction. The EEPROM Memory Page is stored by loading
the Write EEPROM Memory Page Instruction with the 7 MSB of the address. When using
EEPROM page access only byte locations loaded with the Load EEPROM Memory Page
instruction is altered. The remaining locations remain unchanged. If polling (RDY/BSY) is
309
8161D–AVR–10/09
ATMEL [ ATMEL ]
