ST18AU1_DS View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST18AU1_DS' PDF : 87 Pages View PDF
ST18-AU1
13 CLOCKS AND TIMERS UNIT
The clocks and timers unit provides all the necessary clocks and timer controls for DSP
processing, and all input/output operations. In addition, a 90 kHz System Time Clock (STC) is
provided to assist audio/video synchronization in systems which include a video decoder.
13.1 Operation
13.1.1 Audio clock prescaler
• inputs
• AUDIOCLK: output of Audio Master clock PLL
• MCLK_MODE: select internal or external Audio System Clock: (If bit CLK_sel1 of
register PSCTR=’0’)
0 = internal
1 = external
• outputs
• MCLK_PCM to PCM Output interface
• MCLK_DIN to Data Input interface
• input/output
• SCLK
The programmable prescaler and clock dividers of Data Input and PCM Output interfaces are
used for the generation of data bit clocks.
The prescaler divide range is 1 to 510. It is defined by the content of the PSCTR register. Its
output SCLKINT is a 50% duty cycle signal.
51/87
Share Link: 
