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AT89C55WD Datasheet(PDF) 23 Page - ATMEL Corporation

Part # AT89C55WD
Description  8-bit Microcontroller with 20K Bytes Flash
PDF  35 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C55WD Datasheet(HTML) 23 Page - ATMEL Corporation

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23
1921C–MICRO–3/05
AT89C55WD
Figure 21-1. Programming the Flash Memory
Figure 21-2. 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



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