HS4318ESS01H datasheet(51/68 Pages) RENESAS

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HD404318 Series

A/D Converter

The MCU also contains a built-in A/D converter that uses a sequential comparison method with a

resistance ladder. It can perform digital conversion of eight analog inputs with 8-bit resolution. The

following describes the A/D converter.

• A/D mode register 1 (AMR1: $019) is used to select digital or analog ports

• A/D mode register 2 (AMR2: $01A) is used to set the A/D conversion speed and to select digital or

analog ports

• The A/D channel register (ACR: $016) is used to select an analog input channel

• A/D conversion is started by setting the A/D start flag (ADSF: $020, 2) to 1. After the conversion is

completed, converted data is stored in the A/D data register, and at the same time, the A/D start flag is

cleared to 0

• By setting the I

AD off flag (IAOF: $021, 2) to 1, the current flowing through the resistance ladder can be

cut off even while operating in standby or active mode

IAD off flag

(IAOF)

A/D channel

A/D mode

(AMR2)

A/D mode

(AMR1)

A/D interrupt

request flag

(IFAD)

Encoder

A/D data

(ADRU, L)

A/D start flag

(ADSF)

D/A

AVCC

AVSS

Operating mode signal (1 in stop mode)

–

Comp

A/D

controller

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

Control signal

for conversion

time

Figure 40 A/D Converter Block Diagram

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