NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 294

• Manufacturer Part Number: NUMICRO-SDK
• Description: KIT EVAUATION NUC100/120/130/140
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r
• Type: MCUr

Specifications of NUMICRO-SDK

• Contents: Board, Cable, CD, Nu-Link
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: NUC100, NUC120, NUC130, NUC140

5.7.4.7
5.7.4.8
The following procedure is recommended for starting a PWM drive.
Method 1:
Set 16-bit down counter (CNR) as 0, and monitor PDR (current value of 16-bit down-counter).
When PDR reaches to 0, disable PWM-Timer (CHxEN in PCR). (Recommended)
Method 2:
Set 16-bit down counter (CNR) as 0. When interrupt request happened, disable PWM-Timer
(CHxEN in PCR). (Recommended)
Method 3:
Disable PWM-Timer directly ((CHxEN in PCR). (Not recommended)
The reason why method 3 is not recommended is that disable CHxEN will immediately stop PWM
output signal and lead to change the duty of the PWM output, this may cause damage to the
control circuit of motor
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PWM-Timer Start Procedure
PWM-Timer Stop Procedure
Setup clock selector (CSR)
Setup prescaler (PPR)
Setup inverter on/off, dead zone generator on/off, auto-reload/one-shot mode and Stop
PWM-timer (PCR)
Setup comparator register (CMR) for setting PWM duty.
Setup PWM down-counter register (CNR) for setting PWM period.
Setup interrupt enable register (PIER)
Setup corresponding GPIO pins as PWM function (enable POE and disable CAPENR)
for the corresponding PWM channel.
Enable PWM timer start running (Set CHxEN = 1 in PCR)
NuMicro™ NUC100 Series Technical Reference Manual
- 294 -
Publication Release Date: Dec. 22, 2010
Revision V1.06