MC9S08SH8CSC 查看數據表（PDF） - Freescale Semiconductor

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MC9S08SH8CSC

HCS08 Microcontrollers

Freescale Semiconductor 

Chapter 16 Timer/PWM Module (S08TPMV3)

When the TPM is configured for center-aligned PWM (and ELSnB:ELSnA not = 0:0), the data direction

for all channels in this TPM are overridden, the TPMxCHn pins are forced to be outputs controlled by the

TPM, and the ELSnA bits control the polarity of each TPMxCHn output. If ELSnB:ELSnA=1:0, the

corresponding TPMxCHn pin is cleared when the timer counter is counting up, and the channel value

register matches the timer counter; the TPMxCHn pin is set when the timer counter is counting down, and

the channel value register matches the timer counter. If ELSnA=1, the corresponding TPMxCHn pin is set

when the timer counter is counting up and the channel value register matches the timer counter; the

TPMxCHn pin is cleared when the timer counter is counting down and the channel value register matches

the timer counter.

TPMxMODH:TPMxMODL = 0x0008

TPMxCnVH:TPMxCnVL = 0x0005

TPMxCNTH:TPMxCNTL ... 7 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 7 6 5 ...

TPMxCHn

CHnF BIT

TOF BIT

Figure 16-5. High-True Pulse of a Center-Aligned PWM

TPMxMODH:TPMxMODL = 0x0008

TPMxCnVH:TPMxCnVL = 0x0005

TPMxCNTH:TPMxCNTL ... 7 8 7 6 5 4

TPMxCHn

321

01 2 3 4 5 6 7 8 7 6

5 ...

CHnF BIT

TOF BIT

Figure 16-6. Low-True Pulse of a Center-Aligned PWM

MC9S08SH8 MCU Series Data Sheet, Rev. 3

Freescale Semiconductor

247

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