HD404339FS datasheet(59/80 Pages) RENESAS

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HD404339 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 twelve 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

• The A/D data register is a read-only register consisting of a lower 4 bits and upper 4 bits (ADRL: $017,

ADRU: $018). This register is not cleared by a reset. Data reads during A/D conversion are not

guaranteed. After A/D conversion ends, the resultant 8-bit data is set in this register and held until the

start of the next conversion (figures 51 to 53).

HD404339FS 데이터시트(PDF) 59 Page - Renesas Technology Corp