Rev. 1.0, 02/00, page 514 of 1141
24.1.2
Block Diagram
Figure 24.1 shows a block diagram of the A/D converter.
φ
/2
φ
/4
ADTRG
Interrupt request
AN0
Vref
AV
CC
AV
SS
Reference Voltage
Sample-and-
hold circuit
Chopper type
comparator
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AN8
AN9
ANA
ANB
DFG
ADTRG
(HSW timing generator)
Internal data bus
[Legend]
ADR
AHR
: Software trigger A/D result register
: Hardware trigger A/D result register
ADTRG, DFG
ADTRG
: Hardware trigger
: A/D external trigger input
ADCR
ADCSR
: A/D control register
: A/D control/status register
ADTSR: A/D trigger selection register
-
+
10-bit
D/A
Hardware
control
circuit
Control circuit
Analog multiplexer
Successive
approximation register
A
D
R
A
H
R
A
D
C
S
R
A
D
C
R
A
D
T
S
R
Figure 24.1 Block Diagram of A/D Converter