M37225M6_15 datasheet(51/128 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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51 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 49 of 124

REJ03B0136-0100Z

8.8 A-D CONVERTER

8.8.1 A-D Conversion Register (AD)

A-D conversion reigister is a read-only register that stores the result

of an A-D conversion. This register should not be read during A-D

conversion.

8.8.2 A-D Control Register (ADCON)

The A-D control register controls A-D conversion. Bits 2 to 0 of this

register select analog input pins. When these pins are not used as

anlog input pins, they are used as ordinary I/O pins. Bit 3 is the A-D

conversion completion bit, A-D conversion is started by writing “0” to

this bit. The value of this bit remains at “0” during an A-D conversion,

then changes to “1” when the A-D conversion is completed.

Bit 4 controls connection between the resistor ladder and VCC. When

not using the A-D converter, the resistor ladder can be cut off from

the internal VCC by setting this bit to “0,” accordingly providing low-

power dissipation.

8.8.3 Comparison Voltage Generator (Resistor

Ladder)

The voltage generator divides the voltage between VSS and VCC by

256, and outputs the divided voltages to the comparator as the refer-

ence voltage Vref.

8.8.4 Channel Selector

The channel selector connects an analog input pin, selected by bits

2 to 0 of the A-D control register, to the comparator.

8.8.5 Comparator and Control Circuit

The conversion result of the analog input voltage and the reference

voltage “Vref” is stored in the A-D conversion register. The A-D con-

version completion bit and A-D conversion interrupt request bit are

set to “1” at the completion of A-D conversion.

Fig. 8.8.1 A-D Converter Block Diagram

A-D control register

(address 00DF16)

A-D control circuit

Data bus

Switch tree

A-D conversion

interrupt request

Resistor ladder

Compa-

rator

A-D conversion register

A-D1

A-D2

A-D3

A-D4

(address 00DE16)

b7

b0

3

8

VSS VCC

A-D5

A-D6

A-D7

A-D8

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