UPD784031 Datasheet, PDF (33/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD784031
8.5 PWM Output (PWM0, PWM1)
Two channels of PWM (pulse width modulation) output circuitry with a resolution of 12 bits and a repetition
frequency of 62.5 kHz (fCLK = 16 MHz) are incorporated. Low or high active level can be selected for the PWM output
channels, independently of each other. This output is best suited to DC motor speed control.
Figure 8-6. Block Diagram of PWM Output Unit
Internal bus
16
PWM modulo register
PWMn 15
87 43 0
8
PWM control register
(PWMC)
8
4
Reload
control
fCLK
Prescaler
8-bit
down-counter
1/256
Pulse control
circuit
4-bit counter
Output
control
PWMn (output pin)
Remark n = 0, 1
33