HCS08 datasheet(235/316 Pages) NXP

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MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

235

Chapter 16



Timer Pulse-Width Modulator (S08TPMV3)

16.1

Introduction

The TPM uses one input/output (I/O) pin per channel, TPMxCHn where x is the TPM number (for

example, 1 or 2) and n is the channel number (for example, 0–1). The TPM shares its I/O pins with

general-purpose I/O port pins (refer to the Pins and Connections chapter for more information).

All MC9S08SG8 MCUs have two TPM modules. The number of channels available depends on the pin

quantity of the package, as shown in Table 16-1:

Figure 16-1 shows the MC9S08SG8 block diagram with the TPM modules highlighted.

16.1.1

ACMP/TPM Configuration Information

The ACMP module can be configured to connect the output of the analog comparator to TPM1 input

capture channel 0 by setting ACIC in SOPT2. With ACIC set, the TPM1CH0 pin is not available externally

regardless of the configuration of the TPM1 module for channel 0.

16.1.2

TPM Configuration Information

The external clock for the TPM modules, TPMCLK, is selected by setting CLKS[B:A] = 1:1 in TPMxSC,

which selects the TCLK pin input. The TCLK input on PTA5 can be enabled as external clock inputs to

both TPM modules and MTIM simultaneously.

Table 16-1. MC9S08SG8 Features by MCU and Package

Feature

MC9S08SG8/4

Pin quantity

TPM1 channels

1 The 8-pin device does not have TPM1CH1 or TPM2CH1

bonded out, but those timer channels are available to the

user to use as software compares.

TPM2 channels

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