NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 289

• 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
5.7.4.1
The PWM period and duty control are configured by PWM down-counter register (CNR) and
PWM comparator register (CMR). The PWM-timer timing operation is shown in Figure 5-41. The
pulse width modulation follows the formula as below and the legend of PWM-Timer Comparator is
shown as Figure 5-40. Note that the corresponding GPIO pins must be configured as PWM
function (enable POE and disable CAPENR) for the corresponding PWM channel.
Note: [1] Unit = one PWM clock cycle.
Note: x= 0~3.
Function Description
PWM-Timer Operation
NuMicro™ NUC100 Series Technical Reference Manual
PWM frequency = PWMxy_CLK/(prescale+1)*(clock divider)/(CNR+1); where xy,
could be 01, 23, 45 or 67, depends on selected PWM channel.
Duty ratio = (CMR+1)/(CNR+1)
CMR >= CNR: PWM output is always high
CMR < CNR: PWM low width= (CNR-CMR) unit[1]; PWM high width = (CMR+1) unit
CMR = 0: PWM low width = (CNR) unit; PWM high width = 1 unit
Figure 5-40 Legend of Internal Comparator Output of PWM-Timer
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Publication Release Date: Oct 22, 2010
Revision V1.06