11.4 Serial Port Programming Circuit And Address Map - Intel 87C196CA Supplement To User’s Manual

8XC196L X SUPPLEMENT

11.4 SERIAL PORT PROGRAMMING CIRCUIT AND ADDRESS MAP

Figure 11-2 shows the circuit and Table 11-4 details the address map for serial port programming.
A B C
RXD
V
CC
1.8k
TXD
1.8k
11-4
30 pF
XTAL1
V
CC
V
P0.7/PMODE.3
P0.6/PMODE.2
P0.5/PMODE.1
P0.4/PMODE.0
ANGND
V
PP
V
EA#
CC
V
0.01 µF
2N2222A
1.8k
2N2907
1.8k
1N914
Figure 11-2. Serial Port Programming Circuit
30 pF
XTAL2
RESET#
REF
V
P2.1/RXD
P2.0/TXD
PP
87C196LA, LB
1N914
1.8k
10µF
10 µF
CC
5
9
4
8
RXD
3
7
TXD
2
6
1
A5278-01