MC912D60AVPVE8 Datasheet, PDF (210/460 Pages) Freescale Semiconductor, Inc – HC12 Microcontrollers

Pulse Width Modulator
PSBCK
LIMBDM
ECLK
0:0:0
0:0:1
PSBCK IS BIT 0 OF PWCTL REGISTER.
INTERNAL SIGNAL LIMBDM IS ‘1’ IF THE MCU IS IN BACKGROUND DEBUG MODE.
CLOCK A
0:0:0
÷2
0:0:1
8-BIT DOWN COUNTER ^{= 0}
PWSCNT0
0:1:0
÷2
0:1:0
0:1:1
÷2
0:1:1
1:0:0
÷2
1:0:0
1:0:1
÷2
1:0:1
1:1:0
÷2
1:1:0
1:1:1
÷2
1:1:1
8-BIT SCALE REGISTER
PWSCAL0
÷2
CLOCK B
8-BIT DOWN COUNTER ^{= 0}
PWSCNT1
BITS:
PCKB2,
PCKB1,
PCKB0
REGISTER:
PWPRES
BITS:
PCKA2,
PCKA1,
PCKA0
8-BIT SCALE REGISTER
PWSCAL1
÷2
*CLOCK S0 = A/2 * (PWSCAL0 + 1)
**CLOCK S1 = B/2 * (PWSCAL1 + 1)
Figure 13-3. PWM Clock Sources
13.3 PWM Register Description
CLOCK TO PWM
CHANNEL 0
PCLK0
CLOCK TO PWM
CHANNEL 1
PCLK1
CLOCK TO PWM
CHANNEL 2
PCLK2
CLOCK TO PWM
CHANNEL 3
PCLK3
Bit 7
6
5
CON23 CON01 PCKA2
RESET:
0
0
0
PWCLK — PWM Clocks and Concatenate
4
PCKA1
0
3
PCKA0
0
2
PCKB2
0
1
PCKB1
0
Bit 0
PCKB0
0
Read and write anytime.
$0040
Technical Data
210
Pulse Width Modulator
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor