IA8044/IA8344
Data Sheet
SDLC Communications Controller
March 30, 2010
Table 11. Port 0 Register
7
6
5
4
3
2
1
0
P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0
4.6.2 Port 1 (P1)
Table 12 presents the values for Port 1 (P1), a general purpose, eight-bit, I/O port with pullups and
auxiliary functions.
Table 12. Port 1 Register
7
6
5
4
3
2
1
0
CTS/P1.7 RTS/P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0
Bit [7]—P1.7/Clear To Send input
Bit [6]—P1.6/Request To Send output
Bit [5]—P1.5
Bit [4]—P1.4
Bit [3]—P1.3
Bit [2]—P1.2
Bit [1]—P1.1
Bit [0]—P1.0
4.6.3 Port 2 (P2)
Table 13 presents the values for Port 2, a general purpose, 8-bit, I/O port with pullups and high
order address bus.
Table 13. Port 2 Register
7
6
5
4
3
2
1
0
P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0
4.6.4 Port 3 (P3)
Table 14 presents the values for Port 2, a general purpose, 8-bit I/O port with pullups and auxiliary
functions. Bits on this port also function as the SIU data transmit/receive I/O, external interrupt
inputs, timer inputs and the read and write strobes for external memory accesses.
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