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Application:
GP I/O
Port B
Control Register (PBC)
X:$FFC0 Read/Write
Reset = $0000
Port B
Data Direction Register (PBDDR)
X:$FFC2 Read/Write
Reset = $0000
Port B
Data Register (PBD)
X:$FFE2 Read/Write
Reset = $0000
MOTOROLA
DSP56156 General Purpose I/O Programming Sheet
Port B
15 14 13 12 11 10
* * * * * * * * * * * * * * *
0
0
0
Figure C-15 Control Register (PBC)
15 14 13 12 11 10
*
DB14 DB13 DB12 DB11 DB10 DB9
0
Figure C-16 Data Direction Register (PBDDR)
15 14 13 12 11 10
*
PB14 PB13 PB12 PB11 PB10 PB9
0
Figure C-17 Data Register (PBD)
PROGRAMMING SHEETS
9
8
0
0
0
0
0
0
0
Port B Data Direction Control
0 = Input
1 = Output
9
8
DB8
Port B Data (usually loaded by program)
9
8
PB8
Date:
Programmer:
Sheet 1 of 2
Port B Control
0 = General Purpose I/O
1 = Host Interface
7
6
5
4
3
2
0
0
0
0
0
0
0
0
= Reserved, Program as zero
*
7
6
5
4
3
2
DB7
DB6
DB5
DB4
DB3
DB2
= Reserved, Program as zero
*
7
6
5
4
3
2
PB7
PB6
PB5
PB4
PB3
PB2
= Reserved, Program as zero
*
C - 27
1
0
BC
0
0
1
0
DB1
DB0
1
0
PB1
PB0
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