T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
11 GPIO Ports (continued)
11.1 GPIO Register Set (continued)
Table 91. GPDIR1: GPIO Port 1 Pin Direction (0x39)
Reg
R/W
Bit 7
DIR1.7
1
Bit 6
DIR1.6
1
Bit 5
DIR1.5
1
Bit 4
DIR1.4
1
Bit 3
DIR1.3
1
Bit 2
DIR1.2
1
Bit 1
DIR1.1
1
Bit 0
DIR1.0
1
GPDIR1
R/W
RESET Default
Bit #
Symbol
Name/Description
7—0
DIR1.[7:0]
GPIO1.[7:0] Pin Direction.
0: Output.
1: Input.
Note: When any of bits 7:5 in register GPAF1 are set, the corresponding DIR1.x value in
this register is ignored and the pin function is determined according to the GPAF1
register function.
Table 92. GPDIR2: GPIO Port 2 Pin Direction (0x3A)
Reg
R/W
Bit 7
DIR2.7
1
Bit 6
DIR2.6
1
Bit 5
DIR2.5
1
Bit 4
DIR2.4
1
Bit 3
DIR2.3
1
Bit 2
DIR2.2
1
Bit 1
DIR2.1
1
Bit 0
DIR2.0
1
GPDIR2
R/W
RESET Default
Bit #
Symbol
Name/Description
7—0
DIR2.[7:0]
GPIO2.[7:0] Pin Direction. DIR2.x defines the pin direction for GPIO2.x.
0: Output.
1: Input.
Notes: When any of bits 3:1 in register GPAF1 are set, the corresponding DIR2.x value
in this register is ignored and the pin function is determined according to the
GPAF1 register function.
When DOCR[LT_NT] bit is set to 1 (NTN device is in LT mode), the DIR2.6 value
is ignored and pin GPIO2.6 becomes an input to the 8 kHz MTC signal.
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