Figure 51. ports 1, 2, 5, and 6 internal structur, 1 configuring ports 1, 2, 5, and 6 (bidirectio – Intel 8XC196Lx User Manual
Page 47
5-3
I/O PORTS
Figure 5-1. Ports 1, 2, 5, and 6 Internal Structure (87C196LA, LB Only)
5.2.1
Configuring Ports 1, 2, 5, and 6 (Bidirectional Ports)
Using the port mode register, you can individually configure each pin for port 1, 2, 5, and 6 to
operate either as a general-purpose I/O signal (I/O mode) or as a special-function signal (special-
function mode). In either mode, three configurations are possible: complementary output, high-
Q2
Q1
P
x
_MODE
P
x
_DRV
SFDIR
0
1
P
x
_REG
Sample
Latch
PH1 Clock
Internal Bus
SFDATA
Any Write to P
x
_MODE
Q
R
Weak
Pullup
RESET#
Q3
Q4
Buffer
Read Port
S
300ns Delay
I/O Pin
RESET#
A5265-01
150
Ω
to 200
Ω
R1
0
1
V
SS
Medium
Pullup
V
SS
V
SS
V
CC
RESET#
P
x
_PIN
D
Q
LE