Freescale Semiconductor DSP56366 - Manual (Page 214)

GPIO - Pins and Registers
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
9-14 Freescale Semiconductor
9.5.2 Port E Direction Register (PRRE)
The read/write 24-bit Port E Direction Register (PRRE) in conjunction with the Port E Control Register
(PCRE) controls the functionality of the ESAI_1 GPIO pins.
Table 9-4 describes the port pin
configurations. Hardware and software reset clear all PRRE bits.
9.5.3 Port E Data register (PDRE)
The read/write 24-bit Port E Data Register (see Figure 9-17 ) is used to read or write data to/from ESAI_1
GPIO pins. Bits PD(11:0) are used to read or write data from/to the corresponding port pins if they are
configured as GPIO. If a port pin [i] is configured as a GPIO input, then the corresponding PD[i] bit will
reflect the value present on this pin. If a port pin [i] is configured as a GPIO output, then the value written
into the corresponding PD[i] bit will be reflected on this pin. If a port pin [i] is configured as disconnected,
the corresponding PD[i] bit is not reset and contains undefined data.
Table 9-4 PCRE and PRRE Bits Functionality
PDE[i] PE[i] Port Pin[i] Function
0 0 disconnected
0 1 GPIO input
1 0 GPIO output
1 1 ESAI_1
11 10 9 8 7 6 5 4 3 2 1 0
Y:$FFFF9F PE11 PE10 PE9 PE8 PE7 PE6 PE4 PE3 PE1 PE0
23 22 21 20 19 18 17 16 15 14 13 12
Reserved bit - read as zero; should be written with zero for future compatibility.
Figure 9-15 PCRE Register
11 10 9 8 7 6 5 4 3 2 1 0
Y:$FFFF9E PDE11 PDE10 PDE9 PDE8 PDE7 PDE6 PDE4 PDE3 PDE1 PDE0
23 22 21 20 19 18 17 16 15 14 13 12
Reserved bit - read as zero; should be written with zero for future compatibility.
Figure 9-16 PRRE Register