Analog Die General-Purpose Timers; Analog Die General-Purpose Timers Features; Afe Pwm - Analog Devices ADuCM356 Reference Manual

Reference Manual

ANALOG DIE GENERAL-PURPOSE TIMERS

ANALOG DIE GENERAL-PURPOSE TIMERS
FEATURES
The ADuCM356 analog die integrates two identical general-pur-
pose, 16-bit count up or count down timers: AGPT0 and AGPT1.
The timers can be clocked from the 32 kHz internal low frequency
oscillator on the analog die, the analog die PCLK, internal 16 MHz
or 32 MHz high frequency oscillator, or the external clock input.
Clock sources can be scaled down using a prescaler to 1, 4, 16,
or 256. Free running mode and periodic modes are available. The
timers have a PWM output feature. Configure the INTEN register to
enable AFE general-purpose timer interrupts.

AFE PWM

The AFE die in the ADuCM356 has a dedicated PWM output
feature. The high period for the PWM is the difference between
the values in the timer load register and either the PWMMAT0
register or PWMMATCH register. The low period for the PWM is the
difference between either the PWMMAT0 register or PWMMATCH
register and the overflow value 0xFFFF. Increasing and reducing
the load value increases and reduces the frequency of the PWM
output.
The following example sets up the PWM for a duty cycle of 2 ms
(high) period and 1.56 ms (low) period:
void PWM1Init(void)
{
AfeDioCfgPin(pADI_AGPIO2, PIN1, 1);
/*1MHz GPT clock, count up, periodic */
AfeGptCfg(pADI_AGPT1,
TCTL_CLK_PCLK, TCTL_PRE_DIV16, BITM_TMR_CTL_UP|
BITM_TMR_CTL_MODE);
/*count 2000, 2ms period: 64000 – 62000, as►
suming 16MHz clock and prescaler of 16 */
AfeGptLd(pADI_AGPT1,62000);
/*Low period is 65535-64000*/
AfePwmCfg(pADI_AGPT1, PWM_IDLEHI,
PWM_MATCH_MODE);
AfePwmMatch(pADI_AGPT1, 64000);
/*start timer, output PWM*/
pADI_AGPT1->CON1 |= BITM_TMR_CTL_EN;
}
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