Rainbow Electronics AT90C8534 - Manual (Page 42)

AT90C8534
42
Figure 36. Programming the Flash Waveforms
Figure 37. 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 - $0F).
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
PEN
OE
DATA HIGH DATA
XA1
XA0
BS
XTAL1
WR
RDY/BSY
PEN
OE