Rainbow Electronics AT90S1200 - Manual (Page 41)

41
AT90S1200
0838H–AVR–03/02
Figure 31. Programming the Flash Waveforms
Figure 32. Programming the Flash Waveforms (Continued)
Reading the Flash The algorithm for reading the Flash memory is as follows (refer to “Programming the
Flash” for details on command and address loading):
1. A: Load Command “0000 0010”.
2. B: Load Address High Byte ($00 - $01).
3. C: Load Address Low Byte ($00 - $FF).
4. Set OE to “0”, and BS to “0”. The Flash word low byte can now be read at DATA.
5. Set BS to “1”. The Flash word high byte can now be read from DATA.
6. Set OE to “1”.
$10 ADDR. HIGH ADDR.LOW DATA LOW DATA
XA1
XA0
BS
XTAL1
WR
RDY/BSY
RESET
OE
12V
DATA HIGH DATA
XA1
XA0
BS
XTAL1
WR
RDY/BSY
RESET +12V
OE