I write those codes in CodeWarrior, but no signal can be detected in TIOA, I need your help.
main()
{

*AT91C_TC0_CCR = AT91C_TC_CLKDIS;
*AT91C_TC0_IDR = 0xFFFFFFFF;
dummy = *AT91C_TC0_SR;
*AT91C_TC0_CMR = TC_CLKS_MCK128|
AT91C_TC_ASWTRG_SET|
AT91C_TC_ACPC_SET |
AT91C_TC_ACPA_SET |
AT91C_TC_WAVE|
AT91C_TC_WAVESEL_UPDOWN;
*AT91C_TC0_RC = 0x6DDC;
*AT91C_TC0_RA = 0x685F;
*AT91C_TC0_CCR = AT91C_TC_CLKEN;
*AT91C_TC0_CCR = AT91C_TC_SWTRG;
}

Hi Sean,

I am at home now and I cannot try your setting, but, did you enable the clock of the timer at PMC level ?
One remark too, for other users, it more appropriate to call this peripheral Timer/Counter than PWM. Of course, it is possible to use it like PWM but without all needed PWM features as Width Pulse Modualtion synchronously vs. the cycle phase.