NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 290

• 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

5.7.4.2
PWM Timers have double buffering function the reload value is updated at the start of next period
without affecting current timer operation. The PWM counter value can be written into CNRx and
current PWM counter value can be read from PDRx.
The bit CH0MOD in PWM Control Register (PCR) defines PWM0 operates in auto-reload or one-
shot mode If CH0MOD is set to one, the auto-reload operation loads CNR0 to PWM counter when
PWM counter reaches zero. If CNR0 are set to zero, PWM counter will be halt when PWM
counter counts to zero. If CH0MOD is set as zero, counter will be stopped immediately.
PWM1~PWM7 performs the same function as PWM0.
down-counter
PWM-Timer
Comparator
write a nonzero number to
prescaler & setup clock
dividor
Waveform
output
(CMR)
PWM
PWM
PWM Double Buffering, Auto-reload and One-shot Operation
(Write initial setting)
Auto reload = 1
(CHxMOD=1)
NuMicro™ NUC100 Series Technical Reference Manual
CMR = 1
CNR = 3
(PWM-Timer starts running)
CNR=150
CMR=50
Write
3
1
Set ChxEN=1
Start
Figure 5-42 PWM Double Buffering Illustration
Figure 5-41 PWM-Timer Operation Timing
3
CNR=199
CMR=49
Write
151
2
(S/W write new value)
1
51
1
- 290 -
CMR = 0
CNR = 4
(PWMIFx is set by H/W)
0
(H/W update value)
CNR=99
Auto-load
CMR=0
Write
Publication Release Date: Dec. 22, 2010
4
200
3
50
2
0
CMR=XX
CNR=0
Write
1
100
Revision V1.06
(PWMIFx is set by H/W)
1
Stop
0
Auto-load
4