Datasheet

AT89S53
4-238
Figure 13.
Programming the Flash Memory
P1
P2.6
P3.6
P2.0 - P2.5
A0-A7
ADDR.
0000H/2FFFH
SEE FLASH
PROGRAMMING
MODES TABLE
3-24 Mhz
A8 - A13
P0
+5V
P2.7
PGM
DATA
PROG
V
PP
V
I H
ALE
P3.7
XTAL2 EA
RST
PSEN
XTAL1
GND
V
CC
AT89S53
Figure 14.
Flash Serial Downloading
P1.7/SCK
DATA OUTPUT
INSTRUCTION
INPUT
CLOCK IN
3-24 Mhz
+4.0V to 6.0V
P1.5/MOSI
V
I H
XTAL2
RSTXTAL1
GND
V
CC
AT89S53
P1.6/MISO
Figure 15.
Verifying the Flash Memory
P1
P2.6
P3.6
P2.0 - P2.5
A0-A7
ADDR.
0000H/2FFFH
SEE FLASH
PROGRAMMING
MODES TABLE
3-24 Mhz
A8 - A13
P0
+5V
P2.7
PGM DATA
(USE 10K
PULLUPS)
V
I H
V
I H
ALE
P3.7
XTAL2 EA
RST
PSEN
XTAL1
GND
V
CC
AT89S53
V
PP