Port E Data Register (Pdre); Figure 8-11 Port E Data Register (Pdre); Table 8-4 Port Control Register And Port Direction - Motorola DSP56305 User Manual

The following table describes the port signal configurations.
Table 8-4 Port Control Register and Port Direction Register Bits Functionality
8.5.3

Port E Data Register (PDRE)

The read/write 24-bit PDRE is used to read or write data to or from SCI GPIO signals.
Bits PD[2:0] are used to read or write data from or to the corresponding port signals if
they are configured as GPIO. If a port signal [i] is configured as a GPIO input, then the
corresponding PD[i] bit reflects the value of this signal. If a port signal [i] is configured
as a GPIO output, then the value of the corresponding PD[i] bit is reflected on this signal.
7
15
23
Note: Hardware and software reset clear all PDRE bits.
MOTOROLA
PC[i] PDC[i]
1 1 or 0
0 0
0 1
6 5 4 3
PD2
13 12 11
14
19
21 20
22
Reserved Bit, Read as 0, Should be Written with 0 for Future Compatibility

Figure 8-11 Port E Data Register (PDRE)

DSP56305 User's Manual
Serial Communication Interface (SCI)
Port Signal[i] Function
SCI
GPIO input
GPIO output
2 1 0
PD1 PD0
Data Value Bits
10 9 8
18 17 16
GPIO Signals and Registers
AA0697
8-31