Figure 7-18 Port Control Register (Pcr) (Pcrc X:$Ffffbf); Figure 7-19 Port Direction Register (Prr)(Prrc X:$Ffffbe) - Motorola DSP56309 User Manual

Enhanced Synchronous Serial Interface (ESSI)
GPIO Signals and Registers
RESET signal or a software RESET instruction clears all PCR bits. Figure 7-18 shows the
PCR bits.
7 6
PC5
STDn
13
15 14
21
23 22
Reserved Bit, Read As Zero, Should Be Written With Zero For Future Compatibility

Figure 7-18 Port Control Register (PCR) (PCRC X:$FFFFBF)

7.6.2 Port Direction Register (PRR)
The read/write, 24-bit PRR controls the data direction of the ESSI GPIO signals. When
PRR[i] is set, the corresponding signal is an output signal. When PRR[i] is cleared, the
corresponding signal is an input signal. Figure 7-19 shows the PRR bits.
7 6 5
PDC5
STDn
13
15 14
21
23 22
Reserved Bit, Read As Zero, Should Be Written With Zero For Future Compatibility

Figure 7-19 Port Direction Register (PRR)(PRRC X:$FFFFBE)

7-44
5 4 3 2
PC4 PC3
PC2
SRDn SCKn SCKn2 SCKn1 SCKn0
12 11 10
20 19 18
(PCRD X:$FFFFAF)
4 3 2
PDC4 PDC3 PDC2
SRDn SCKn SCKn2 SCKn1 SCKn0
11 10
12
20 19 18
(PRRD X:$FFFFAE)
DSP56309UM/D
1 0
PC1 PC0 0 = GPIO, 1 = ESSI
PCRC: ESSI0, PCRD: ESSI1
9 8
17 16
1 0
0 = Input, 1 = Output
PDC1 PDC0
PRRC: ESSI0, PRRD: ESSI1
9 8
17 16
AA0688
AA0689
MOTOROLA