Programming Examples
13-20 ADSP-21368 SHARC Processor Hardware Reference
/* Enable PCGA SCLK & FSYNC and set FSYNC_A divisor */
r0 = (ENCLKA | ENFSA | PCGA_FS_DIVISOR);
dm(PCG_CTLA0) = r0;
/* Set PCGB SCLK & FSYNC Source first to Xtal Buffer and set
SCLK_B divisor */
r0 = ((PCGB_FS_PHASE_LO << 20) | PCGB_CLK_DIVISOR);
dm(PCG_CTLB1) = r0;
/* Enable PCGB SCLK and disable FSYNC_B */
r0 = (ENCLKB | ENFSB | PCGB_FS_DIVISOR);
dm(PCG_CTLB0) = r0;
ustat1 = dm(PCG_CTLB0);
bit clr ustat1 ENFSA;
dm(PCG_CTLB0) = ustat1;
/* Set FSYNC_A and FSYNC_B Pulse Width to 50% Duty Cycle
(default) */
r0 = 0x00000000;
dm(PCG_PW) = r0;
dm(PCG_SYNC) = r0;
Init_PCG.end:
rts;
Clock and Frame Sync Divisors PCG Channel B
This section provides two programming examples written for the
ADSP-21369 processor. The first listing, Listing 13-2, uses PCG channel
B to output a clock on DAI pin 1 and frame sync on DAI pin 2. The input
used to generate the clock and frame sync is CLKIN. This example demon-
strates the clock and frame sync divisors, as well as the pulse width and
phase shift capabilities of the PCG.
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