Datasheet

User’s Manual U18698EJ1V0UD
291
CHAPTER 12 10-BIT SUCCESSIVE APPROXIMATION TYPE A/D CONVERTER (
μ PD78F041x only)
12.1 Function of 10-Bit Successive Approximation Type A/D Converter
The 10-bit successive approximation type A/D converter converts an analog input signal into a digital value, and
consists of up to 6 channels (ANI0 to ANI5) 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
ANI5. Each time an A/D conversion operation ends, an interrupt request (INTAD) is generated.
Figure 12-1. Block Diagram of 10-Bit Successive Approximation type A/D Converter
AVREF
AVSS
INTAD
ADCS bit
Sample & hold circuit
AVSS
Voltage comparator
A/D converter mode
register (ADM)
Internal bus
3
ADS2 ADS1 ADS0
Analog input channel
specification register (ADS)
ANI0/P20
ANI1/P21
ANI2/P22
ANI3/P23
ANI4/P24
ANI5/P25
Controller
A/D conversion result
register (ADCR)
Successive
approximation
register (SAR)
A/D port configuration
register 0 (ADPC0)
ADPC02ADPC01 ADPC00
3
Selector
Tap selector
ADCS FR2FR3 FR1 ADCEFR0 LV1 LV0
6