NEC mPD789101, User Manual

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User’s Manual U13045EJ2V0UM00
135
CHAPTER 11 8-BIT A/D CONVERTER (
µ
PD789104, 789124 SUBSERIES)
11.1 8-Bit A/D Converter Functions
The 8-bit A/D converter is an 8-bit resolution converter to convert analog input to digital signals. This converter
can control up to four channels of analog inputs (ANI0 to ANI3).
A/D conversion can only be started by software.
One of analog inputs ANI0 to ANI3 is selected for A/D conversion. A/D conversion is performed repeatedly, with
an interrupt request (INTAD0) being issued each time an A/D session is completed.
11.2 8-Bit A/D Converter Configuration
The 8-bit A/D converter consists of the following hardware.
Table 11-1. Configuration of 8-Bit A/D Converter
Item Configuration
Analog input 4 channels (ANI0 to ANI3)
Register Successive approximation register (SAR)
A/D conversion result register 0 (ADCR0)
Control register A/D converter mode register 0 (ADM0)
A/D input selection register 0 (ADS0)