EM78459AM datasheet(40/62 Pages) EMC

40 / 62 page

EM78458/459

8-Bit Microcontroller with MASK ROM

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Product Specification (V1.4) 05.27.2005

(This specification is subject to change without further notice)

4.8

Dual Sets of PWM ( Pulse Width Modulation )

4.8.1 Overview

In PWM mode, both PWM1 and PWM2 pins produce up to a 10-bit resolution PWM

output (see. Fig. 13 for the functional block diagram). A PWM output has a period and

a duty cycle, and it keeps the output in high. The baud rate of the PWM is the inverse of

the period. Fig. 14 depicts the relationships between a period and a duty cycle.

Data Bus

PRD1

Com parator

TM R1H + TM R1L

MUX

Duty Cycle

Match

Period

Match

PWM1

T1P0

T1P1 T1EN

IOC51

PRD2

Com parator

MUX

Duty Cycle

Match

Period

Match

PWM2

T2P0

T2P1 T2EN

IOC51

To PW M 1IF

To PW M 2IF

reset

latch

1:2

1:8

1:32

Fosc

1:64

1:2

1:8

1:32

Fosc

1:64

TM R2H + TM R2L

DT2H

DT2L

DT1H

DT1L

DL2H + DL2L

DL1H + DL1L

Fig. 13 The Functional Block Diagram of the Dual PWMs

Period

Duty Cycle

DT1 = TMR1

PRD1 = TMR1

Fig. 14 The Output Timing of the PWM

EM78459AM Datasheet(PDF) 40 Page - ELAN Microelectronics Corp

EM78459AM Datasheet(HTML) 40 Page - ELAN Microelectronics Corp

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