Block Diagram - Renesas Hitachi H8S/2194 Series Hardware Manual

26.1.2

Block Diagram

Figure 26.1 shows a block diagram of the A/D converter.
Reference Voltage
AV
CC
10-bit
D/A
AV
SS
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AN8
Sample-and-
AN9
hold circuit
ANA
ANB
[Legend]
ADR : Software trigger A/D result register
AHR : Hardware trigger A/D result register
ADCR : A/D control register
ADCSR : A/D control/status register
ADTSR: A/D trigger selection register
Rev. 2.0, 11/00, page 574 of 1037
A
D
R
Hardware
control
circuit
Vref
+
-
Chopper type
comparator
Figure 26.1 Block Diagram of A/D Converter
Internal data bus
A
D
C
A
A
S
D
H
R
C
R
R
Control circuit
ADTRG, DFG : Hardware trigger
ADTRG : A/D external trigger input
A
D
T
S
R
ADTRG
(HSW timing generator)
DFG
ADTRG
/2
/4
Interrupt request