Rainbow Electronics AT89C55WD - Manual (Page 24)

24
AT89C55WD
1921B–MICRO–09/02
Figure 13. Programming the Flash Memory
Figure 14. Verifying the Flash Memory
Note: *Programming address line A14 (P3.4) is not the same as the external memory address line
A14 (P2.6).
P1.0 - P1.7
P2.6
P3.6
P2.0 - P2.5
A0 - A7
ADDR.
0000H/4FFFH
SEE FLASH
PROGRAMMING
MODES TABLE
3 - 33 MHz
A14*
P0
4.5V to 5.5V
P2.7
PGM
DATA
PROG
V /V
IH PP
V
IH
ALE
P3.7
XTAL2 EA
RST
PSEN
XTAL1
GND
V
CC
AT89C55WD
P3.4
P3.3
P3.0
RDY/
BSY
A8 - A13
P1.0 - P1.7
P2.6
P3.6
P2.0 - P2.5
A0 - A7
ADDR.
0000H/4FFFH
SEE FLASH
PROGRAMMING
MODES TABLE
3 - 33 MHz
P0
P2.7
PGM DATA
(USE 10K
PULL-UPS)
V
IH
V
IH
ALE
P3.7
XTAL 2 EA
RST
PSEN
XTAL1
GND
V
CC
A14*
AT89C55WD
P3.4
P3.3
A8 - A13
4.5V to 5.5V