Serial Communication Interface (SCI)
GPIO Signals and Registers
MOTOROLA
DSP56309UM/D 8-27
8.5
GPIO SIGNALS AND REGISTERS
The GPIO functionality of port SCI is controlled by three registers: Port E control register
(PCRE), Port E direction register (PRRE) and Port E data register (PDRE).
8.5.1
Port E Control Register (PCRE)
The read/write, 24-bit PCRE controls the functionality of SCI GPIO signals. Each of the
PC[2:0] bits controls the functionality of the corresponding port signal. When a PC[i] bit
is set, the corresponding port signal is configured as a SCI signal. When a PC[i] bit is
cleared, the corresponding port signal is configured as a GPIO signal. Bits in the Port E
control register appear in
Note:
A hardware RESET signal or a software RESET instruction clears all PCR bits.
8.5.2
Port E Direction Register (PRRE)
The read/write, 24-bit PRRE controls the direction of SCI GPIO signals. When port
signal[i] is configured as GPIO, PDC[i] controls the port signal direction. When PDC[i] is
set, the GPIO port signal[i] is configured as output. When PDC[i] is cleared, the GPIO
port signal[i] is configured as input. Bits in the Port E direction register appear in
.
Figure 8-8
Port E Control Register (PCRE)
PC0
PC1
PC2
Reserved Bit, Read as 0, Should be Written with 0 for Future Compatibility
Port Control Bits: 1 = SCI
0 = GPIO
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
AA0695
Содержание DSP56309
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