Rainbow Electronics ATtiny26L - Manual (Page 114)

114
ATtiny26(L)
1477B–AVR–04/02
Figure 60. Programming the Flash Waveforms (1)
Note: 1. “XX” is don’t care. The letters refer to the programming description above.
Programming the EEPROM The EEPROM is organized in pages, see Table 56 on page 110. 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 112 for details on
Command, Address and Data loading):
1. A: Load Command “0001 0001”.
2. B: Load Address Low Byte ($00 - $FF).
3. C: Load Data ($00 - $FF).
J: Repeat 2 and 3 until the entire buffer is filled
K: Program EEPROM page
1. Set BS1 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 61 for signal waveforms.)
RDY/BSY
WR
OE
RESET +12V
$10 ADDR. LOW ADDR. HIGH DATA
DATA LOW DATA HIGH ADDR. LOW DATA LOW DATA HIGH
XA1/BS2
XA0
PAGEL/BS1
XTAL1
XX
A B C D B C D F G
E