Freescale Semiconductor, Inc.
Pulse Width Modulator
PSBCK
PSBCK IS BIT 0 OF PWCTL REGISTER.
INTERNAL SIGNAL LIMBDM IS ‘1’ IF THE MCU IS IN BACKGROUND DEBUG MODE.
LIMBDM
CLOCK A
CLOCK TO PWM
CHANNEL 0
ECLK
0:0:0
0:0:0
= 0
8-BIT DOWN COUNTER
÷ 2
0:0:1
0:1:0
0:0:1
PWSCNT0
PCLK0
0:1:0
÷ 2
CLOCK TO PWM
CHANNEL 1
8-BIT SCALE REGISTER
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
0:1:1
÷ 2
PWSCAL0
÷ 2
1:0:0
÷ 2
PCLK1
CLOCK B
CLOCK TO PWM
CHANNEL 2
1:0:1
÷ 2
= 0
8-BIT DOWN COUNTER
PWSCNT1
1:1:0
1:1:1
÷ 2
÷ 2
PCLK2
CLOCK TO PWM
CHANNEL 3
BITS:
BITS:
REGISTER:
PWPRES
8-BIT SCALE REGISTER
PWSCAL1
PCKA2,
PCKA1,
PCKA0
PCKB2,
PCKB1,
PCKB0
÷ 2
PCLK3
*CLOCK S0 = A/2 * (PWSCAL0 + 1)
**CLOCK S1 = B/2 * (PWSCAL1 + 1)
Figure 13-3. PWM Clock Sources
13.3 PWM Register Description
Bit 7
CON23
0
6
CON01
0
5
PCKA2
0
4
PCKA1
0
3
PCKA0
0
2
PCKB2
0
1
PCKB1
0
Bit 0
PCKB0
0
RESET:
PWCLK — PWM Clocks and Concatenate
$0040
Read and write anytime.
Advance Information
184
68HC(9)12D60 — Rev 4.0
MOTOROLA
Pulse Width Modulator
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MOTOROLA [ MOTOROLA ]
