A-D CONVERTER
12.2 Block description
12.2 Block description
Figure 12.2.1 shows the block diagram of the A-D converter. Registers relevant to the A-D converter are
described below.
Selection of A-D conversion frequency
(1,1)
(1,0)
f
f
1
2
φAD
(0,1)
(0,0)
1/2
1/2
VREF connection select bit
A-D conversion frequency (
select bits 1, 0
φAD)
0
1
V
REF
V
ref
Resistor ladder
network
AVSS
A-D control register 1
Comparator function select register 0
A-D control register 0
Selector
1
Selector
Control circuit
Successive
approximation register
Comparator result register 0
A-D register 0
A-D register 1
A-D register 2
A-D register 3
Comparator
Decoder
A-D register 4
Data bus (odd)
Data bus (even)
AN
AN
AN
AN
AN
0
1
2
3
4
Selector
Fig. 12.2.1 Block diagram of A-D converter
7906 Group User’s Manual Rev.2.0
12-4
RENESAS [ RENESAS TECHNOLOGY CORP ]
