Freescale Semiconductor, Inc.
Pulse Width Modulator
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 12-1.
Table 12-1. Clock A and Clock B Prescaler
PCKA2 PCKA1 PCKA0
Value of
(PCKB2) (PCKB1) (PCKB0) Clock A (B)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
P
P ÷ 2
P ÷ 4
P ÷ 8
P ÷ 16
P ÷ 32
P ÷ 64
P ÷ 128
Bit 7
PCLK3
0
6
PCLK2
0
5
PCLK1
0
4
3
2
PPOL2
0
1
PPOL1
0
Bit 0
PPOL0
0
PCLK0
0
PPOL3
0
RESET:
PWPOL — PWM Clock Select and Polarity
$0041
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.
Technical Data
MC68HC912DG128 — Rev 3.0
Pulse Width Modulator
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