Table 161. pin multiplexing, Table 16-1). if y, N. table 16-1 – Intel 386 User Manual
Page 484
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16-5
INPUT/OUTPUT PORTS
Table 16-1. Pin Multiplexing
Port Pin
Peripheral Function
Pin
Reset Status
Signal
Direction
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.
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