M37754 Mitsubishi, M37754 Datasheet - Page 56

• Manufacturer Part Number: M37754
• Description: SINGLE-CHIP 16BIT CMOS MICROCOMPUTER
• Manufacturer: Mitsubishi

A-D CONVERTER
The A-D converter is a 10-bit successive approximation converter.
The use of A-D converter or the use of comparator can be selected
for each A-D input pin. The contents of the comparator function se-
lect register specify it.
Figure 68 shows a block diagram of the A-D converter.
Fig. 68 A-D converter block diagram
56
AV
V
Successive approximation
register
REF
SS
A-D register 5 (2B
A-D register 6 (2D
A-D register 7 (2F
A-D register 0 (21
A-D register 1 (23
A-D register 2 (25
A-D register 3 (27
A-D register 4 (29
Data bus (odd)
V
select bit
REF
f(X
IN
connection
)
AN
Address
7
/AD
16
16
16
16
16
16
16
16
Ladder network
Control circuit
)
)
)
)
)
)
)
)
AN
AN
AN
AN
AN
AN
AN
TRG
Clock source select bit
(bit 6 of processor mode register 1)
1/2
0
1
2
3
4
5
6
0
1
A-D register 6 (2C
A-D register 0 (20
A-D register 1 (22
A-D register 2 (24
A-D register 3 (26
A-D register 4 (28
A-D register 5 (2A
A-D register 7 (2E
Data bus (even)
1
1
Comparator function select register
(0: A-D converter, 1: Comparator)
Address
M37754M8C-XXXGP, M37754M8C-XXXHP
Comparator result register
(Address 66
16
16
16
16
16
16
16
16
1/2
)
)
)
)
)
)
)
)
Vref
A-D conversion speed selection
Selector
Selector
0
1
16
Clock source for peripheral
devices select bit
(bit 2 of processor mode register 1)
)
Selector
Pf
2
M37754S4CGP, M37754S4CHP
(Address 64
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
1/2
16
Decoder
)
1/2
MITSUBISHI MICROCOMPUTERS
A-D control register 1
A-D control register 0
(Address 1E
(Address 1F
Pf
Pf
Pf
1
2
4
8
16
16
)
)
Frequency select
flag 0, 1
AD
Compa-
rator