ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 300
ATmega325PA
Manufacturer Part Number
ATmega325PA
Description
Manufacturer
Atmel Corporation
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8285D–AVR–06/11
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
4. The Flash is programmed one page at a time. The page size is found in
5. A: The EEPROM array is programmed one byte at a time by supplying the address and
6. Any memory location can be verified by using the Read instruction which returns the con-
7. At the end of the programming session, RESET can be set high to commence normal
8. Power-off sequence (if needed):
Table 27-15. Minimum Wait Delay Before Writing the Next Flash or EEPROM Location
Symbol
t
t
t
t
WD_FUSE
WD_FLASH
WD_EEPROM
WD_ERASE
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.
page
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
not used, the user must wait at least t
27-15.) Accessing the serial programming interface before the Flash write operation
completes can result in incorrect programming.
data together with the appropriate Write instruction. An EEPROM memory location is first
automatically erased before new data is written. If polling
user must wait at least t
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 2 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 4 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 (
not used, the user must wait at least t
27-15). In a chip erased device, no 0xFF in the data file(s) need to be programmed.
tent at the selected address at serial output MISO.
operation.
Set RESET to “1”.
Turn V
286. The memory page is loaded one byte at a time by supplying the 6 LSB of the
CC
power off
WD_EEPROM
before issuing the next byte (See
WD_EEPROM
WD_FLASH
before issuing the next page. (See
before issuing the next page (See
Minimum Wait Delay
(
RDY/BSY) is not used, the
4.5ms
4.5ms
3.6ms
9.0ms
Table
Table 27-7 on
27-15). In a
(
RDY/BSY) is
RDY/BSY
Table
Table
) is
300
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