M37151 datasheet(47/139 Pages) RENESAS

Part #	M37151

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP

MITSUBISHI MICROCOMPUTERS

46

Rev. 1.0

8.8 A-D COMPARATOR

The A-D comparator consists of a 7-bit D-A converter and a com-

parator. The A-D comparator block diagram is shown in Figure 8.8.1.

The reference voltage “Vref” for D-A conversion is set by bits 0 to 6 of

A-D control register 2 (address 00ED16).

The comparison result of the analog input voltage and the reference

voltage “Vref” is stored in bit 4 of A-D control register 1 (address

00EC16).

For A-D comparison, set “0” to corresponding bits of the direction

register to use ports as analog input pins. Write the data to select

analog input pins for bits 0 to 2 of A-D control register 1 and write the

digital value corresponding to Vref to be compared to bits 0

to 4 of A-D control register 2. The voltage comparison is started by

writing to A-D control register 2, and it is completed after 16 machine

cycles (NOP instruction ✕ 8).

Fig. 8.8.1 A-D Comparator Block Diagram

A-D control register 1

Bits 0 to 2

Comparator control

Data bus

Bit 4

Switch tree

A-D control

register 2

Resistor ladder

Compa-

rator

Analog

signal

switch

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

A-D control

register 1

AD1

AD2

AD3

AD4

AD5

AD6

AD7

AD8

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