Intel 386 - Manual (Page 484)

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