IA8044/IA8344
SDLC COMMUNICATIONS CONTROLLER
Data Sheet
Port 3 (P3):
General purpose, 8-bit I/O port with pullups and auxiliary functions. Bits on this port also
functions as the SIU data transmit/receive I/O, external interrupt inputs, timer inputs and the read
and write strobes for external memory accesses.
P3
Bit: 7
6
5
4
3
2
1
0
RD
WR
T1
T0
INT1
INT0
TxD
RxD
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
RxD
TxD
INT0
INT1
T0
T1
WR
RD
Serial input pin.
Serial output pin.
External interrupt 0.
External interrupt 1.
Timer/Counter 0 external input.
Timer/Counter 1 external input.
External Data Memory write strobe, active LOW.
External Data Memory read strobe, active LOW.
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innovASIC
ENG210010112-00
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