HCS08 datasheet(290/374 Pages) NXP

290 / 374 page

Timer/PWM Module (S08TPMV3)

MC9S08JM60 Series Data Sheet, Rev. 5

290

Freescale Semiconductor

16.5

Reset Overview

16.5.1

General

The TPM is reset whenever any MCU reset occurs.

16.5.2

Description of Reset Operation

Reset clears the TPMxSC register which disables clocks to the TPM and disables timer overflow interrupts

(TOIE=0). CPWMS, MSnB, MSnA, ELSnB, and ELSnA are all cleared which configures all TPM

channels for input-capture operation with the associated pins disconnected from I/O pin logic (so all MCU

pins related to the TPM revert to general purpose I/O pins).

16.6

Interrupts

16.6.1

General

The TPM generates an optional interrupt for the main counter overflow and an interrupt for each channel.

The meaning of channel interrupts depends on each channel’s mode of operation. If the channel is

configured for input capture, the interrupt flag is set each time the selected input capture edge is

recognized. If the channel is configured for output compare or PWM modes, the interrupt flag is set each

time the main timer counter matches the value in the 16-bit channel value register.

All TPM interrupts are listed in Table 16-8 which shows the interrupt name, the name of any local enable

that can block the interrupt request from leaving the TPM and getting recognized by the separate interrupt

processing logic.

The TPM module will provide a high-true interrupt signal. Vectors and priorities are determined at chip

integration time in the interrupt module so refer to the user’s guide for the interrupt module or to the chip’s

complete documentation for details.

16.6.2

Description of Interrupt Operation

For each interrupt source in the TPM, a flag bit is set upon recognition of the interrupt condition such as

timer overflow, channel-input capture, or output-compare events. This flag may be read (polled) by

software to determine that the action has occurred, or an associated enable bit (TOIE or CHnIE) can be set

Table 16-8. Interrupt Summary

Interrupt

Local

Enable

Source

Description

TOF

TOIE

Counter overflow

Set each time the timer counter reaches its terminal

count (at transition to next count value which is

usually 0x0000)

CHnF

CHnIE

Channel event

An input capture or output compare event took

place on channel n

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