MC9S12P128 Datasheet, PDF (329/564 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Pulse-Width Modulator (PWM8B6CV1) Block Description
10.2.4 PWM2 — Pulse Width Modulator Channel 2 Pin
This pin serves as waveform output of PWM channel 2.
10.2.5 PWM1 — Pulse Width Modulator Channel 1 Pin
This pin serves as waveform output of PWM channel 1.
10.2.6 PWM0 — Pulse Width Modulator Channel 0 Pin
This pin serves as waveform output of PWM channel 0.
10.3 Memory Map and Register Definition
This subsection describes in detail all the registers and register bits in the PWM8B6CV1 module.
The special-purpose registers and register bit functions that would not normally be made available to
device end users, such as factory test control registers and reserved registers are clearly identified by means
of shading the appropriate portions of address maps and register diagrams. Notes explaining the reasons
for restricting access to the registers and functions are also explained in the individual register descriptions.
10.3.1 Module Memory Map
The following paragraphs describe the content of the registers in the PWM8B6CV1 module. The base
address of the PWM8B6CV1 module is determined at the MCU level when the MCU is defined. The
register decode map is fixed and begins at the first address of the module address offset. Table 10-1 shows
the registers associated with the PWM and their relative offset from the base address. The register detail
description follows the order in which they appear in the register map.
Reserved bits within a register will always read as 0 and the write will be unimplemented. Unimplemented
functions are indicated by shading the bit.
Table 10-1 shows the memory map for the PWM8B6CV1 module.
NOTE
Register address = base address + address offset, where the base address is
defined at the MCU level and the address offset is defined at the module
level.
Table 10-1. PWM8B6CV1 Memory Map
Address
Offset
0x0000
0x0001
0x0002
0x0003
0x0004
Register
PWM Enable Register (PWME)
PWM Polarity Register (PWMPOL)
PWM Clock Select Register (PWMCLK)
PWM Prescale Clock Select Register (PWMPRCLK)
PWM Center Align Enable Register (PWMCAE)
Access
R/W
R/W
R/W
R/W
R/W
S12P-Family Reference Manual, Rev. 1.12
Freescale Semiconductor
329