sc9s08mz16 Freescale Semiconductor, Inc, sc9s08mz16 Datasheet - Page 147

• Manufacturer Part Number: sc9s08mz16
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
Timer/PWM (S08TPMV3)
9.1
Introduction
The SC9S08MZ16 includes three independent timer/PWM (TPM) modules which support traditional
input capture, output compare, or buffered edge-aligned pulse-width modulation (PWM) on each channel.
A control bit in each TPM configures all channels in that timer to operate as center-aligned PWM
functions. In each TPM, timing functions are based on a separate 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
on the TPM extends the field of applications to motor control in small appliances.
The use of the fixed system clock, XCLK, as the clock source for any of the TPM modules allows the TPM
prescaler to run using the oscillator rate divided by two (ICGERCLK/2). This option is only available if
the ICG is configured in FEE mode and the proper conditions are met (see
Section 8.4.11, “Fixed
Frequency
Clock”). In all other ICG modes this selection is redundant because XCLK is the same as
BUSCLK.
An external clock source can be connected to the TPMCLK pin. The maximum frequency for TPMCLK
is the bus clock frequency divided by 4. All three TPM modules can independently select TPMCLK as the
clock source.
SC9S08MZ16 MCU Data Sheet, Rev. 1
Freescale Semiconductor
147