A/D Converter Block Diagram - NEC PD78076 User Manual

Pd78078 series; pd78078y series 8-bit single-chip microcontrollers
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Internal Bus
A/D Converter
Input Select Register
ADIS3
ADIS2 ADIS1 ADIS0
4
ANI0/P10
ANI1/P11
Note 1
ANI2/P12
ANI3/P13
ANI4/P14
ANI5/P15
ANI6/P16
ANI7/P17
INTP3/P03
Note 3
ES40, ES41
Trigger
Enable
CS
TRG
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. Bits 0, 1 of external interrupt mode register 1 (INTM1)
294
CHAPTER 15 A/D CONVERTER
Figure 15-1. A/D Converter Block Diagram
Sample & Hold Circuit
Note 2
3
Edge
Detector
FR1
FR0 ADM3 ADM2 ADM1
Internal Bus
Series Resistor String
Voltage
Comparator
Successive
Approximation
Register (SAR)
Control
Circuit
A/ D Conversion
Result Register
(ADCR)
AV
DD
AV
REF0
AV
SS
INTAD
INTP3

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