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Signal/Connection Descriptions
3.8
Enhanced Serial Audio Interface
Table 8. Enhanced Serial Audio Interface Signals
Signal
Name
HCKR
Signal Type
Input or output
State during
Reset
GPIO
disconnected
Signal Description
High Frequency Clock for Receiver —When programmed as an
input, this signal provides a high frequency clock source for the
ESAI receiver as an alternate to the DSP core clock. When
programmed as an output, this signal can serve as a
high-frequency sample clock (for example, for external digital to
analog converters [DACs]) or as an additional system clock.
PC2
Input, output, or
disconnected
Port C2 —When the ESAI is configured as GPIO, this signal is
individually programmable as input, output, or internally
disconnected.
The default state after reset is GPIO disconnected.
Internal Pull down resistor.
This input is 5 V tolerant.
HCKT
Input or output
GPIO
disconnected
High Frequency Clock for Transmitter —When programmed as
an input, this signal provides a high frequency clock source for the
ESAI transmitter as an alternate to the DSP core clock. When
programmed as an output, this signal can serve as a high
frequency sample clock (for example, for external DACs) or as an
additional system clock.
PC5
Input, output, or
disconnected
Port C5 —When the ESAI is configured as GPIO, this signal is
individually programmable as input, output, or internally
disconnected.
The default state after reset is GPIO disconnected.
Internal Pull down resistor.
This input is 5 V tolerant.
DSP56371 Data Sheet, Rev. 4.1
Freescale Semiconductor
19
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