MC912DG128A Motorola, MC912DG128A Datasheet - Page 174

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

Pulse-Width Modulator
MC68HC912DT128A Rev 2.0
174
LIMBDM
PSBCK
ECLK
*CLOCK S0 = (CLOCK A)/2, (CLOCK A)/4, (CLOCK A)/6,... (CLOCK A)/512
**CLOCK S1 = (CLOCK B)/2, (CLOCK B)/4, (CLOCK B)/6,... (CLOCK B)/512
BITS:
PCKB2,
PCKB1,
PCKB0
0:0:0
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
PSBCK IS BIT 0 OF PWCTL REGISTER.
INTERNAL SIGNAL LIMBDM IS ONE IF THE MCU IS IN BACKGROUND DEBUG MODE.
REGISTER:
PWPRES
2
2
2
2
2
2
2
0:0:0
0:0:1
0:1:0
1:0:0
1:1:0
0:1:1
1:0:1
1:1:1
BITS:
PCKA2,
PCKA1,
PCKA0
Figure 24 PWM Clock Sources
Pulse-Width Modulator
8-BIT SCALE REGISTER
8-BIT DOWN COUNTER
8-BIT SCALE REGISTER
8-BIT DOWN COUNTER
PWSCNT1
PWSCNT0
PWSCAL1
PWSCAL0
CLOCK B
CLOCK A
= 0
= 0
2
2
PCLK3
PCLK0
PCLK1
PCLK2
CLOCK TO PWM
CHANNEL 3
CLOCK TO PWM
CHANNEL 1
CLOCK TO PWM
CHANNEL 2
CLOCK TO PWM
CHANNEL 0
MOTOROLA
4-pwm