HD404338 查看數據表（PDF） - Renesas Electronics

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HD404338

4-bit HMCS400-Series microcomputer with large-capacity memory

Renesas Electronics 

HD404339 Series

Notes on Usage

• Use the SEM or SEMD instruction for writing to the A/D start flag (ADSF)

• Do not write to the A/D start flag during A/D conversion

• Data in the A/D data register during A/D conversion is undefined

• Since the operation of the A/D converter is based on the clock from the system oscillator, the A/D

converter does not operate in stop, watch, or subactive mode. In addition, to save power while in these

modes, all current flowing through the converter’s resistance ladder is cut off.

• If the power supply for the A/D converter is to be different from VCC, connect a 0.1-µF bypass capacitor

between the AVCC and AVSS pins. (However, this is not necessary when the AVCC pin is directly

connected to the VCC pin.)

• The port data register (PDR) is initialized to 1 by an MCU reset. At this time, if pull-up MOS is selected

as active by bit 3 of the miscellaneous register (MIS3), the port will be pulled up to VCC. When using a

shared R port/analog input pin as an input pin, clear PDR to 0. Otherwise, if pull-up MOS is selected by

MIS3 and PDR is set to 1, a pin selected by bit 1 of the A/D mode registr as an analog pin will remain

pulled up.

A/D mode register 1 (AMR1: $019)

Bit

Initial value

Read/Write

Bit name

3

0

W

AMR13

2

1

0

0

W

W

AMR12 AMR11

0

0

W

AMR10

AMR12

0

1

AMR13

0

1

R32/AN2 Mode Selection

R32

AN2

R33/AN3 Mode Selection

R33

AN3

AMR10

0

1

AMR11

0

1

R30/AN0 Mode Selection

R30

AN0

R31/AN1 Mode Selection

R31

AN1

Figure 46 A/D Mode Register 1 (AMR1)

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