M37207M8-059SP datasheet(42/121 Pages) MITSUBISHI

42 / 121 page

MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

Fig. 37. 14-bit PWM (DA) Output Example (at f(XIN) = 8 MHz)

250 ns

b6 b5 b4 b3 b2 b1

011

b13

010

110

1010

Set “2C16” to DA-H register.

[DA-H

At writing of DA-L

b6 b5 b4 b3 b2 b1

100

Set “2816” to DA-L register.

[DA-L register]

At writing of DA-L

Undefined

These bits decide “H” level area of

fundamental waveform.

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

area is [“H” level area of fundamental waveform +

τ ].

Minimum

resolution bit

width 250 ns

High-order 8-bit

value of DA latch

“H” level area of

fundamental waveform

FE FD …

……

…

02 01

14-bit

PWM output

8-bit

counter

250 ns!44

FE FD

02 01

14-bit

PWM output

8-bit

counter

250 ns!44

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 DA latch

250 ns!44

τ = 250 ns

T = 4096 µs

Repeat period

t59

t60

t61

t62

t63

[DA latch]

2C 2B 2A … 03 02 01 00

Latch transfer complete bit

Transfer complete

Transfer is not completed

(Automatically set at writing)

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