HD404374 Datasheet, PDF (108/161 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip A/D Converter

HD404374/HD404384/HD404389/HD404082/HD404084 Series
Usage notes:
• Use the SEM or SEMD instruction to write to the A/D start flag (ADSF).
• Do not write to the ADSF during A/D conversion.
• Data in the A/D data register is undetermined during A/D conversion.
• As the A/D converter operates on a clock from OSC, it stops in stop mode, watch mode, and subactive
mode. The current flowing in the A/D converter ladder resistor is also cut in these low-power modes to
reduce power consumption.
• When an analog input pin is selected by the A/D mode register, the pull-up MOS for that pin is
disabled.
• Use of bit 0 of A/D data register-lower (ADRL) is prohibited, but with the emulator it should be written
with 1. This bit need not be written in the mask ROM and ZTAT^TM versions, although writing 1 will
have no effect.
Rev.5.00, Sep.11.2003, page 108 of 161