AT89C55WD View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT89C55WD' PDF : 35 Pages View PDF
AT89C55WD
Figure 21-1. Programming the Flash Memory
4.5V to 5.5V
AT89C55WD
ADDR. A0 - A7 P1.0 - P1.7 VCC
0000H/4FFFH A8 - A13
P2.0 - P2.5 P0
A14*
P3.4
P2.6
SEE FLASH
PROGRAMMING
P2.7
ALE
P3.3
MODES TABLE
P3.6
PGM
DATA
PROG
P3.7
XTAL 2
EA
VIH /VPP
3 - 33 MHz
P3.0
RDY/
BSY
XTAL1
RST
VIH
GND
PSEN
Figure 21-2. Verifying the Flash Memory
4.5V to 5.5V
AT89C55WD
ADDR. A0 - A7 P1.0 - P1.7
VCC
0000H/4FFFH A8 - A13
P2.0 - P2.5 P0
A14*
P3.4
P2.6
SEE FLASH
PROGRAMMING
MODES TABLE
P2.7
ALE
P3.3
P3.6
P3.7
PGM DATA
(USE 10K
PULL-UPS)
VIH
XTAL 2
EA
3 - 33 MHz
XTAL1
RST
VIH
GND
PSEN
Note: *Programming address line A14 (P3.4) is not the same as the external memory address line A14
(P2.6).
23
1921C–MICRO–3/05
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