Rainbow Electronics ATtiny861_V - Manual (Page 176)

176
2588B–AVR–11/06
ATtiny261/461/861
Figure 22-3. Programming the Flash Waveforms (1)
Note: 1. “XX” is don’t care. The letters refer to the programming description above.
22.7.5 Programming the EEPROM
The EEPROM is organized in pages, see Table 22-8 on page 171 . When programming the
EEPROM, the program data is latched into a page buffer. This allows one page of data to be
programmed simultaneously. The programming algorithm for the EEPROM data memory is as
follows (refer to
”Programming the Flash” on page 174 for details on Command, Address and
Data loading):
1. A: Load Command “0001 0001”.
2. G: Load Address High Byte (0x00 - 0xFF).
3. B: Load Address Low Byte (0x00 - 0xFF).
4. C: Load Data (0x00 - 0xFF).
5. E: Latch data (give PAGEL a positive pulse).
K: Repeat 3 through 5 until the entire buffer is filled.
L: Program EEPROM page
1. Set BS to “0”.
2. Give WR a negative pulse. This starts programming of the EEPROM page. RDY/BSY
goes low.
3. Wait until to RDY/BSY goes high before programming the next page (See Figure 22-4 for
signal waveforms).
RDY/BSY
WR
OE
RESET +12V
0x10 ADDR. LOW ADDR. HIGH DATA DATA LOW DATA HIGH ADDR. LOW DATA LOW DATA HIGH
XA1/BS2
XA0
PAGEL/BS1
XTAL1
XX XX XX
A B C D E B C D E G H
F