MM912F634CV2AP datasheet(91/335 Pages) FREESCALE

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Functional Description and Application Information

PWM Control Module (PWM8B2C)

MM912F634

Freescale Semiconductor

4.13.3.1.4

PWM Center Align Enable (CAEx)

NOTE

Write these bits only when the corresponding channel is disabled.

The CAEx bits select either center aligned outputs or left aligned output for both PWM channels. If the CAEx bit is set to a one,

the corresponding PWM output will be center aligned. If the CAEx bit is cleared, the corresponding PWM output will be left

aligned. See Section 4.13.4.2.5, “Left Aligned Outputs"” and Section 4.13.4.2.6, “Center Aligned Outputs"” for a more detailed

description of the PWM output modes.

4.13.3.2

PWM Prescale Clock Select Register (PWMPRCLK)

NOTE

PCKB2–0 and PCKA2–0 register bits can be written anytime. If the clock pre-scale is

changed while a PWM signal is being generated, a truncated or stretched pulse can occur

during the transition.

This register selects the prescale clock source for clocks A and B independently.

Table 112. PWM Prescale Clock Select Register (PWMPRCLK)

Offset(81) 0x61

Access: User read/write

543

210

PCKB2

PCKB1

PCKB0

PCKA2

PCKA1

PCKA0

Reset

000

Note:

81. Offset related to 0x0200 for blocking access and 0x300 for non blocking access within the global address space.

Table 113. PWMPRCLK - Register Field Descriptions

Field

Description

6–4

PCKB[2:0]

Prescaler Select for Clock B — Clock B is one of two clock sources which can be used for channel 1. These three bits

determine the rate of clock B, as shown in Table 114.

2–0

PCKA[2:0]

Prescaler Select for Clock A — Clock A is one of two clock sources which can be used for channel 0. These three bits

determine the rate of clock A, as shown in Table 115.

Table 114. Clock B Prescaler Selects

PCKB2

PCKB1

PCKB0

Value of Clock B

D2D clock

D2D clock / 2

D2D clock / 4

D2D clock / 8

D2D clock / 16

D2D clock / 32

D2D clock / 64

D2D clock / 128

MM912F634CV2AP Datasheet(PDF) 91 Page - Freescale Semiconductor, Inc

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