Datasheet

Rev.6.00 Oct.28.2004 page 540 of 1016
REJ09B0138-0600H
16.1.2 Block Diagram
Figure 16-1 shows a block diagram of the A/D converter.
Module data bus
Control circuit
Internal data bus
10-bit D/A
Comparator
Legend:
+
–
Sample-and-
hold circuit
ADI
interrupt
Bus interface
A
D
C
S
R
A
D
C
R
A
D
D
R
D
A
D
D
R
C
A
D
D
R
B
A
D
D
R
A
AV
CC
Vref
AVSS
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
ADTRG
8-bit timer or
conversion start
trigger from TPU
Successive approximations
register
Multiplexer
ADCR:
ADCSR
ADDRA
ADDRB
ADDRC
ADDRD
A/D control register
: A/D control/status register
: A/D data register A
: A/D data register B
: A/D data register C
: A/D data register D
Figure 16-1 Block Diagram of A/D Converter
16.1.3 Pin Configuration
Table 16-1 summarizes the input pins used by the A/D converter.
The AV
CC
and AV
SS
pins are the power supply pins for the analog block in the A/D converter. The V
ref
pin is the A/D
conversion reference voltage pin.
The eight analog input pins are divided into two groups: group 0 (AN0 to AN3), and group 1 (AN4 to AN7).