M37225M6_15 datasheet(49/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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49 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 47 of 124

REJ03B0136-0100Z

Fig. 8.7.3 14-bit PWM Timing (f(XIN) = 8 MHz)

0.25

µs

b7b0

b6b5b4b3b2b1

0

01

0110

b13b6

00

01

0110

b0

b5

10

100

0

Set “2C16” to DAi-H register.

[DAi-H

register]

DH

At writing of DAi-L

b0

b6b5b4b3b2b1

0

10100

Set “2816” to DAi-L register.

[DAi-L register]

DL

At writing of DAi-L

These bits decide HIGH level area

of fundamental waveform.

These bits decide smaller interval “tm” in which HIGH leval

area is [HIGH level area of fundamental waveform +

τ ].

=

Minimum

resolution bit

width 0.25

µs

High-order 8-bit

value of DAi latch

✕

HIGH level area of

fundamental waveform

FF

00

D3

FE FD … D6

D4

02 01

D5

14-bit

PWM output

8-bit

counter

0.25

µs✕44

FF

00

D3

FE FD

D6

D4

02 01

D5

14-bit

PWM output

8-bit

counter

0.25

µs✕45

Fundamental

waveform

Waveform of smaller interval “tm” specified by low-order 6 bits

Fundamental waveform of smaller interval

“tm” which is not specified by low-order 6

bits is not changed.

14-bit PWM output

Low-order 6-bit output of

DAi latch

0.25

µs✕44

τ = 0.25 µs

T = 4096

µs

Repeat period

t0

t1

t2

t3

t4

t5

t59

t60

t61

t62

t63

[DAi latch]

……

…

b7

2C 2B 2A

03 02 01 00

2C 2B 2A

03 02 01 00

…

Note: i indicates 0 or 1.

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