80C451 Datasheet, PDF (19/22 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, expanded I/O

Philips Semiconductors
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, expanded I/O
Product specification
80C451/83C451/87C451
A0–A7
1
1
1
4–6MHz
1
ALE/PROG:
0
1
ALE/PROG:
0
A0–A7
1
1
1
4–6MHz
+5V
P1
RST
P3.6
P3.7
XTAL2
XTAL1
V_SS
V_CC
P0
87C451
EA/V_PP
ALE/PROG
PSEN
P2.7
P2.6
P2.0–P2.4
Figure 18. Programming Configuration
PGM DATA
+12.75V
25 100µs PULSES TO GROUND
0
1
0
A8–A12
SU00096
25 PULSES
10µs MIN
100µs+10
Figure 19. PROG Waveform
P1
RST
P3.6
P3.7
XTAL2
XTAL1
V_SS
+5V
V_CC
P0
87C451
EA/V_PP
ALE/PROG
PSEN
P2.7
P2.6
P2.0–P2.4
Figure 20. Program Verification
PGM DATA
1
1
0
0 ENABLE
0
A8–A12
SU00097
SU00018
1998 May 01
19