Pin Multiplexing - Intel 386 User Manual

Port Pin
Pin Reset Status
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
NOTES:
1. wk 0 = weakly pulled down; wk 1 = weakly pulled up.
2. I = input; O = output.
Table 16-1. Pin Multiplexing
(1)
Signal
wk 1 DCD0#
wk 1 RTS0#
wk 1 DTR0#
wk 1 DSR0#
wk 1 RI0#
wk 1 LOCK#
wk 0 HOLD
wk 0 HLDA
wk 1 CS0#
wk 1 CS1#
wk 1 CS2#
wk 1 CS3#
wk 1 CS4#
wk 0 RXD0
wk 0 TXD0
wk 1 CTS0#
wk 0 TMROUT0
wk 0 TMROUT1
wk 0 INT0
wk 0 INT1
wk 0 INT2
wk 0 INT3
wk 0 PWRDOWN
wk 0 COMCLK
INPUT/OUTPUT PORTS
Peripheral Function
Internal
(2)
Direction
Peripheral
I
O
O
I
I
O
I
O
O
O
O
O
O
I
O
I
O Timer 0
O Timer 1
I
I
I
I
O CLK & PM
I SIO0, SIO1
SIO0
SIO0
SIO0
SIO0
SIO0
BIU
BIU
BIU
CSU
CSU
CSU
CSU
CSU
SIO0
SIO0
SIO0
ICU
ICU
ICU
ICU
16-5