3886 datasheet(33/111 Pages) RENESAS

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3886 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

PULSE WIDTH MODULATION (PWM)

OUTPUT CIRCUIT

The 3886 group has two PWM output circuits, PWM0 and PWM1,

with 14-bit resolution respectively. These can operate indepen-

dently. When the oscillation frequency XIN is 10 MHz, the

minimum resolution bit width is 200 ns and the cycle period is

3276.8

µs. The PWM timing generator supplies a PWM control

signal based on a signal that is the frequency of the XIN clock.

Fig. 29 PWM block diagram (PWM0)

The following explanation assumes f(XIN) = 8 MHz.

1/2

PWM0 enable bit

P30 latch

P30/PWM00

PWM0L register (address 003116)

PWM0H register

(address 003016)

bit 7

bit 0

bit 5

MSB

LSB

PWM0

bit 7

bit 0

PWM0

timing

generator

(64

µs period)

(4096

µs period)

PWM0 latch (14 bits)

Set to “1”

at write

Data Bus

f(XIN)

(8MHz)

14-bit PWM0 circuit

P56 direction register

PWM0 enable bit

P56 latch

P56/DA1/PWM01

PWM0 output selection bit

P30 direction register

(4MHz)

PWM0 enable bit

PWM0 output selection bit

3886 Datasheet(PDF) 33 Page - Renesas Technology Corp

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