Chapter 13 A/D Converter; Function Of A/D Converter - NEC 78K0 Series User Manual

13.1 Function of A/D Converter

The A/D converter converts an analog input signal into a digital value, and consists of up to eight channels (ANI0 to
ANI7) with a resolution of 10 bits.
The A/D converter has the following function.
• 10-bit resolution A/D conversion
10-bit resolution A/D conversion is carried out repeatedly for one analog input channel selected from ANI0 to
ANI7. Each time an A/D conversion operation ends, an interrupt request (INTAD) is generated.
ANI0/P20
ANI1/P21
ANI2/P22
ANI3/P23
ANI4/P24
ANI5/P25
ANI6/P26
ANI7/P27
3
ADS2 ADS1 ADS0 ADPC3 ADPC2 ADPC1 ADPC0
Analog input channel
specification register (ADS)
304

CHAPTER 13 A/D CONVERTER

Figure 13-1. Block Diagram of A/D Converter
Sample & hold circuit
AV
SS
4
ADCS FR2 FR1
A/D port configuration
register (ADPC)
Internal bus
Preliminary User's Manual U17260EJ3V1UD
Voltage comparator
Successive
approximation
register (SAR)
Controller
A/D conversion result
register (ADCR)
5
FR0 LV1 LV0 ADCE
A/D converter mode
register (ADM)
AV
REF
ADCS bit
AV
SS
INTAD