Datasheet

272
2503Q–AVR–02/11
ATmega32(L)
ten. Note that the entire page is written simultaneously and any address within the page can be
used for polling. Data polling of the Flash will not work for the value $FF, so when programming
this value, the user will have to wait for at least t
WD_FLASH
before programming the next page. As
a chip erased device contains $FF in all locations, programming of addresses that are meant to
contain $FF, can be skipped. See Table 114 for t
WD_FLASH
value
Data Polling EEPROM When a new byte has been written and is being programmed into EEPROM, reading the
address location being programmed will give the value $FF. At the time the device is ready for a
new byte, the programmed value will read correctly. This is used to determine when the next
byte can be written. This will not work for the value $FF, but the user should have the following in
mind: As a chip erased device contains $FF in all locations, programming of addresses that are
meant to contain $FF, can be skipped. This does not apply if the EEPROM is re-programmed
without chip erasing the device. In this case, data polling cannot be used for the value $FF, and
the user will have to wait at least t
WD_EEPROM
before programming the next byte. See Table 114
for t
WD_EEPROM
value.
Figure 137. SPI Serial Programming Waveforms
Table 114. Minimum Wait Delay before Writing the Next Flash or EEPROM Location
Symbol Minimum Wait Delay
t
WD_FLASH
4.5ms
t
WD_EEPROM
9.0ms
t
WD_ERASE
9.0ms
t
WD_FUSE
4.5ms
MSB
MSB
LSB
LSB
SERIAL CLOCK INPUT
(SCK)
SERIAL DATA INPUT
(MOSI)
(MISO)
SAMPLE
SERIAL DATA OUTPUT