Chapter 22 Multichannel Audio Serial Port (McASP).pdf

Functional Description www.ti.com
22.3 Functional Description
22.3.1 Overview
Figure 22-2 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.
3930 Multichannel Audio Serial Port (McASP) SPRUH73E–October 2011–Revised May 2012
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