M38511EF-SP 查看數據表（PDF） - Renesas Electronics

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M38511EF-SP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

3851 Group (Built-in 24 KB or more ROM)

b7

b0

PWM control register

(PWMCON : address 001D16)

PWM function enable bit

0: PWM disabled

1: PWM enabled

Count source selection bit

0: f(XIN) (f(XCIN) at low-speed mode)

1: f(XIN)/2 (f(XCIN)/2 at low-speed mode)

Not used (return “0” when read)

Fig. 42 Structure of PWM control register

PWM output

PWM register

write signal

B= C

T T2

A

B

C

T

T

T2

(Changes “H” term from “A” to “B”.)

PWM prescaler

write signal

(Changes PWM period from “T” to “T2”.)

When the contents of the PWM register or PWM prescaler have changed, the PWM

output will change from the next period after the change.

Fig. 43 PWM output timing when PWM register or PWM prescaler is changed

Note

The PWM starts after the PWM function enable bit is set to enable and “L” level is output from the PWM pin.

The length of this “L” level output is as follows:

n+1

sec

2 • f(XIN)

(Count source selection bit = 0, where n is the value set in the prescaler)

n+1 sec (Count source selection bit = 1, where n is the value set in the prescaler)

f(XIN)

Rev.1.01 Oct 15, 2003 page 41 of 89

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