343
7679H–CAN–08/08
AT90CAN32/64/128
1.
Set XA1, XA0 to “10”. This enables command loading.
2.
Set BS1 to “0”.
3.
Set DATA to “0001 0000”. This is the command for Write Flash.
4.
Give XTAL1 a positive pulse. This loads the command.
B
: Load Address Low byte
1.
Set XA1, XA0 to “00”. This enables address loading.
2.
Set BS1 to “0”. This selects low address.
3.
Set DATA = Address low byte (0x00 - 0xFF).
4.
Give XTAL1 a positive pulse. This loads the address low byte.
C
: Load Data Low Byte
1.
Set XA1, XA0 to “01”. This enables data loading.
2.
Set DATA = Data low byte (0x00 - 0xFF).
3.
Give XTAL1 a positive pulse. This loads the data byte.
D
: Load Data High Byte
1.
Set BS1 to “1”. This selects high data byte.
2.
Set XA1, XA0 to “01”. This enables data loading.
3.
Set DATA = Data high byte (0x00 - 0xFF).
4.
Give XTAL1 a positive pulse. This loads the data byte.
E
: Latch Data
1.
Set BS1 to “1”. This selects high data byte.
2.
Give PAGEL a positive pulse. This latches the data bytes. (See
for signal
waveforms)
F
: Repeat B through E until the entire buffer is filled or until all data within the page is loaded.
While the lower bits in the address are mapped to words within the page, the higher bits
address the pages within the FLASH. This is illustrated in
. Note that
if less than eight bits are required to address words in the page (pagesize < 256), the most
significant bit(s) in the address low byte are used to address the page when performing a
Page Write.
G
: Load Address High byte
1.
Set XA1, XA0 to “00”. This enables address loading.
2.
Set BS1 to “1”. This selects high address.
3.
Set DATA = Address high byte (0x00 - 0xFF).
4.
Give XTAL1 a positive pulse. This loads the address high byte.
H
: Program Page
1.
Give WR a negative pulse. This starts programming of the entire page of data.
RDY/BSY goes low.
2.
Wait until RDY/BSY goes high (See
for signal waveforms).
I
: Repeat B through H until the entire Flash is programmed or until all data has been
programmed.
J
: End Page Programming
