Operating Modes - Motorola DSP56367 User Manual

Enhanced Serial Audio Interface 1 (ESAI_1)

Operating Modes

11.4 OPERATING MODES
11.4.1 ESAI_1 AFTER RESET
Hardware or software reset clears the EMUXR register, the port E control register bits and the
port E direction control register bits, which configure all 6 ESAI_1 dedicated I/O pins as
disconnected, and all 4 shared pins as belonging to the ESAI. The ESAI_1 is in the individual
reset state while all ESAI_1 signals are programmed as general-purpose I/O or disconnected,
and is active only if at least one of the ESAI_1 I/O pins is programmed as belonging to the
ESAI_1.
11.5 GPIO - PINS AND REGISTERS
The GPIO functionality of the ESAI_1 port is controlled by three registers: Port E Control
register (PCRE), Port E Direction register (PRRE) and Port E Data register (PDRE).
11.5.1 PORT E CONTROL REGISTER (PCRE)
The read/write 24-bit Port E Control Register (PCRE) in conjunction with the Port E
Direction Register (PRRE) controls the functionality of the ESAI_1 GPIO pins. Each of the
PE(11:0) bits controls the functionality of the corresponding port pin. See Table 11-4 for the
port pin configurations. Hardware and software reset clear all PCRE bits.
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