NXP Semiconductors MC9S08LG16, Справочное руководство

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MC9S08LG32 MCU Series, Rev. 5
Freescale Semiconductor 306
Chapter 16
Timer/Pulse-Width Modulator (S08TPMV3)
16.1 Introduction
The TPM is a one-to-eight-channel timer system which supports traditional input capture, output compare,
or edge-aligned PWM on each channel. A control bit allows the TPM to be configured such that all
channels may be used for center-aligned PWM functions. Timing functions are based on a 16-bit counter
with prescaler and modulo features to control frequency and range (period between overflows) of the time
reference. This timing system is ideally suited for a wide range of control applications, and the
center-aligned PWM capability extends the field of application to motor control in small appliances.
Figure 16-1 shows the MC9S08LG32 series block diagram with the TPM blocks and pins highlighted.
16.1.1 TPM External Clock
The TPM modules on the MC9S08LG32 series use the TPMCLK pin.
16.1.2 Module Instances
The MC9S08LG32 series MCUs contain two TPM modules: TPM1 and TPM2. The memory map, pins,
interrupts, etc. for the two modules can be differentiated using the TPM1 and TPM2 nomenclature.
16.1.3 Module Configuration
The TPM module pins, TPMxCHn can be repositioned under software control using TPM2CH5,
TPM2CH4, TPM2CH3, TPM2CH2, TPM2CH1, TPM2CH0, TPM1CH1, and TPM1CH0 bits in PINPS2
register as shown in
Table 16-1 . TPM2CH5, TPM2CH4, TPM2CH3, TPM2CH2, TPM2CH1, TPM2CH0,
TPM1CH1, and TPM1CH0 bits in PINPS2 register selects which general-purpose I/O ports are associated
with TPM operation.
Table 16-1. TPM Position Options
TPMxCHn Port Pin for TPM2CH5 Port Pin for TPM2CH4 Port Pin for TPM2CH3 Port Pin for TPM2CH2
0 (default) PTF3 PTF4 PTF5 PTF0
1 PTH6 PTH7 PTI2 PTI3
TPMxCHn Port Pin for TPM2CH1 Port Pin for TPM2CH0 Port Pin for TPM1CH1 Port Pin for TPM1CH0
0 (default) PTA6 PTA5 PTF2 PTF1
1 PTI4 PTI5 PTH4 PTH5