Philips Semiconductors
Product specification
CMOS single-chip 8-bit microcontrollers
80C31/80C51/87C51
+5V
V
CC
P0
A0–A7
PGM DATA
P1
1
1
1
RST
P3.6
+12.75V
EA/V
PP
25 100µs PULSES TO GROUND
ALE/PROG
PSEN
0
1
87C51
P3.7
XTAL2
P2.7
0
P2.6
4–6MHz
XTAL1
A8–A11
P2.0–P2.3
V
SS
SU00017
Figure 13. Programming Configuration
25 PULSES
1
0
ALE/PROG:
ALE/PROG:
10µs MIN
100µs+10
1
0
SU00018
Figure 14. PROG Waveform
+5V
V
CC
P0
A0–A7
PGM DATA
P1
1
1
1
RST
P3.6
1
1
EA/V
PP
ALE/PROG
PSEN
0
87C51
P3.7
0 ENABLE
XTAL2
P2.7
0
P2.6
4–6MHz
XTAL1
A8–A11
P2.0–P2.3
V
SS
SU00019
Figure 15. Program Verification
22
1996 Aug 16
NXP [ NXP ]
