A/D Converter Block Diagram - NEC PD78081(A) User Manual

Internal Bus
ADIS3
ADIS2 ADIS1 ADIS0
4
ANI0/P10
ANI1/P11
ANI2/P12
Note 1
ANI3/P13
ANI4/P14
ANI5/P15
ANI6/P16
ANI7/P17
INTP3/P03
Note 3
ES40, ES41
Trigger Enable
CS TRG FR1 FR0 ADM3 ADM2 ADM1
A/D Converter Mode Register
Notes 1. Selector to select the number of channels to be used for analog input.
2. Selector to select the channel for A/D conversion.
3. External interrupt mode register 1 (INTM1) bits 0 and 1.
120
CHAPTER 10 A/D CONVERTER
Figure 10-1. A/D Converter Block Diagram
A/ D Converter Input Select Register
Sample & Hold Circuit
Note 2
3
Edge
Detector
Voltage
Comparator
Successive
Approximation
Register (SAR)
Control
Circuit
A/ D Conversion
HSC
Result Register
(ADCR)
Internal Bus
Series Resistor String
AV
DD
AV
REF
AV
SS
INTAD
INTP3