Datasheet

Pulse Width Modulator
Technical Data MC68HC912D60A — Rev. 3.1
212 Pulse Width Modulator Freescale Semiconductor
PCKB2 – PCKB0 — Prescaler for Clock B
Clock B is one of two clock sources which may be used for channels
2 and 3. These three bits determine the rate of clock B, as shown in
Table 13-1.
Read and write anytime.
PCLK3 — PWM Channel 3 Clock Select
0 = Clock B is the clock source for channel 3.
1 = Clock S1 is the clock source for channel 3.
PCLK2 — PWM Channel 2 Clock Select
0 = Clock B is the clock source for channel 2.
1 = Clock S1 is the clock source for channel 2.
PCLK1 — PWM Channel 1 Clock Select
0 = Clock A is the clock source for channel 1.
1 = Clock S0 is the clock source for channel 1.
Table 13-1. Clock A and Clock B Prescaler
PCKA2
(PCKB2)
PCKA1
(PCKB1)
PCKA0
(PCKB0)
Value of
Clock A (B)
000 P
001 P ÷ 2
010 P ÷ 4
011 P ÷ 8
100P ÷ 16
101P ÷ 32
110P ÷ 64
111P ÷ 128
Bit 7654321Bit 0
PCLK3 PCLK2 PCLK1 PCLK0 PPOL3 PPOL2 PPOL1 PPOL0
RESET: 00000000
PWPOL — PWM Clock Select and Polarity $0041