EM785830AA

8-bit Micro-controller

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* This specification is subject to be changed without notice.

31

12/1/2004

V1.6

VII.9 Code Option

CODE Option Register

13

12

11

10

9

8

7

6

5

4

3

2

1

0

0

0

1

MER

Bit 3(MER) : Memory error recover function

0

disable memory error recover function

1

enable memory error recovery function

If user enable memory error recovery function, MCU will improve effect from environment noise.

Bit 9: This bit must set to 1.

Bit10 ~ Bit11 : These 2 bits must clear to 0.

VII.10 Dual sets of PWM (Pulse Width Modulation)

(1) Overview

In PWM mode, both PWM1 and PWM2 pins produce up to a 10-bit resolution PWM output (see. Fig.12

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.13 depicts the relationships between a

period and a duty cycle.

Data Bus

Data Bus

PRD1

Comparator

Comparator

TMR1H + TMR1L

S

RQ

MUX

Duty Cycle

Match

Period

Match

PWM1

T1P0 T1P1 T1EN

IOC6

PRD2

Comparator

Comparator

S

RQ

MUX

Duty Cycle

Match

Period

Match

PWM2

T2P0 T2P1 T2EN

IOC6

To PWM1IF

To PWM2IF

reset

reset

latch

latch

1:2

1:8

1:32

Fosc

1:64

1:2

1:8

1:32

Fosc

1:64

TMR2H + TMR2L

DT2H

+

DT2L

DT2H

+

DT2L

DL2H + DL2L

DL2H + DL2L

Fig.12 The Functional Block Diagram of the Dual PWMs