Functional Description
22.3 Functional Description
22.3.1 Overview
shows the major blocks of the McASP. The McASP has independent receive/transmit clock
generators and frame sync generators, error-checking logic, and up to four serial data pins. See the
device-specific data manual for the number of data pins available on your device.
All the McASP pins on the device may be individually programmed as general-purpose I/O (GPIO) if they
are not used for serial port functions.
The McASP includes the following pins:
•
Serializers;
–
Data pins AXRn: Up to four pins.
•
Transmit clock generator:
–
AHCLKX: McASP transmit high-frequency master clock.
–
ACLKX: McASP transmit bit clock.
•
Transmit Frame Sync Generator;
–
AFSX: McASP transmit frame sync or left/right clock (LRCLK).
•
Receive clock generator;
–
AHCLKR: McASP receive high-frequency master clock.
–
ACLKR: McASP receive bit clock.
•
Receive Frame Sync Generator;
–
AFSR: McASP receive frame sync or left/right clock (LRCLK).
•
Mute in/out;
–
AMUTEIN: McASP mute input (from external device).
–
AMUTE: McASP mute output.
–
Data pins AXRn.
3773
SPRUH73H – October 2011 – Revised April 2013
Multichannel Audio Serial Port (McASP)
Copyright © 2011–2013, Texas Instruments Incorporated