Rainbow Electronics ATmega128RFA1 - Manual (Page 471)

471
8266A-MCU Wireless-12/09
ATmega128RFA1
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 CLKI 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 CLKI 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 Figure 31-3 on page
472 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
Figure 31-5 on page 472.
Note that if less than eight bits are required to address words in the page (page size <
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 (Address bits15:8)
1. Set XA1, XA0 to “00”. This enables address loading.
2. Set BS2, BS1 to “01”. This selects the address high byte.
3. Set DATA = Address high byte (0x00 - 0xFF).
4. Give CLKI a positive pulse. This loads the address high byte.
H. Program Page
1. Set BS2, BS1 to “00”
2. Give WR
___
a negative pulse. This starts programming of the entire page of data.
RDY/BSY
___
goes low.
3. Wait until RDY/BSY
___
goes high (See Figure 31-3 on page 472 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
1. Set XA1, XA0 to “10”. This enables command loading.
2. Set DATA to “0000 0000”. This is the command for No Operation.
3. Give CLKI a positive pulse. This loads the command, and the internal write signals
are reset.