M37207MF datasheet(45/122 Pages) RENESAS

45 / 122 page

MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

A-D COMPARATOR

A-D comparator consists of 6-bit D-A converter and comparator. A-D

comparator block diagram is shown in Figure 40.

The reference voltage “Vref” for D-A conversion is set by bits 0 to 5 of

the A-D control register 2 (address 020A16).

The comparison result of the analog input voltage and the reference

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

00EF16).

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

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

the digital value corresponding to Vref to be compared to the bits 0 to

5 A-D control register 2. The voltage comparison starts by writing to

the A-D control register 2, and it is completed after 16 machine cycles

(NOP instruction ! 8).

Fig. 40. 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 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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