Figure 6.8-16 Center Loading In Up-Down-Count Mode - Nuvoton ISD94124BYI Technical Reference Manual

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PERIOD DATA0

CMPDAT DATA0

PERIOD DATA1

PERIOD DATA0

PERIOD DATA2

CMPDAT DATA1

CMPDAT DATA0

CMPDAT DATA2

6.8.5.12 PWM Counter Operation mode

The PWM counter supports two operation modes: One-shot mode and Auto-reload mode. PWM

counter will operate in One-shot mode if CNTMODEn (PWM_CTL1[21:16]) bit is set to 1, and

operate in Auto-reload mode if set to 0.

In One-shot mode, CMPDAT and PERIOD registers should be written first and then set CNTENn

(PWM_CNTEN[5:0]) bit as 1 to enable PWM prescaler and counter start running. After PWM

counter counted a period, counter value will keep in zero.

User can re-start next one-shot by writing new value to CMP(PWM_CMPDATn[15:0]) bits. If one-

shot counter still running, to update CMPDAT register will cause next one-shot as continuous one-

shot. Besides, to write CMPDAT register twice under continuous one-shot operation, latest value in

CMPDAT register is valid at next one-shot period and only generate one-shot pulse once. Figure

6.8-17 is an example and following is steps sequence.

1. Software writes PERIOD DATA1 and hardware immediately loading PERIOD DATA1 to PBUF

2. Software writes CMPDAT DATA1 which is equal to CMPDAT DATA0 at point 2 and hardware

immediately loading CMPDAT DATA1 to CMPBUF, this event also trigger one-shot.

3. Software writes CMPDAT DATA2 and re-trigger next one-shot (continuous one-shot) at point

4. Software writes CMPDAT DATA3 to cover CMPDAT DATA2 and re-trigger next one-shot at

5. Period loading CMPDAT DATA3 to CMPBUF at point 5.

6. There are no new CMPDAT write in the previous period, and the counter value is kept as zero

ISD94100 Series Technical Reference Manual

point 2 point 3 point 4 point 5

PERIOD DATA1

PERIOD DATA0

CMPDAT DATA1