HCS08 datasheet(169/290 Pages) MOTOROLA

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Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

169

MC9S08GB/GT

CHnIE — Channel n Interrupt Enable

This read/write bit enables interrupts from channel n. Reset clears the CHnIE bit.

1 = Channel n interrupt requests enabled.

0 = Channel n interrupt requests disabled (use software polling).

MSnB — Mode Select B for TPM Channel n

When CPWMS = 0, MSnB = 1 configures TPM channel n for edge-aligned PWM mode. For a

summary of channel mode and setup controls, refer to Table 10-3.

MSnA — Mode Select A for TPM Channel n

When CPWMS = 0 and MSnB = 0, MSnA configures TPM channel n for input capture mode or output

compare mode. Refer to Table 10-3 for a summary of channel mode and setup controls.

If the associated port pin is not stable for at least two bus clock cycles before changing to input capture

mode, it is possible to get an unexpected indication of an edge trigger. Typically, a program would clear

status flags after changing channel configuration bits and before enabling channel interrupts or using the

status flags to avoid any unexpected behavior.

ELSnB:ELSnA — Edge/Level Select Bits

Depending on the operating mode for the timer channel as set by CPWMS:MSnB:MSnA and shown

in Table 10-3, these bits select the polarity of the input edge that triggers an input capture event, select

the level that will be driven in response to an output compare match, or select the polarity of the PWM

output.

Table 10-3 Mode, Edge, and Level Selection

CPWMS

MSnB:MSnA

ELSnB:ELSnA

Mode

Configuration

XXX

Pin not used for TPM channel; use as an external clock for the TPM or

revert to general-purpose I/O

Input capture

Capture on rising edge only

Capture on falling edge only

Capture on rising or falling edge

Output compare

Toggle output on compare

Clear output on compare

Set output on compare

Edge-aligned

PWM

High-true pulses (clear output on compare)

Low-true pulses (set output on compare)

1XX

Center-aligned

PWM

High-true pulses (clear output on compare-up)

Low-true pulses (set output on compare-up)

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