MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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.
V
REF connection
select bit
V
REF
Vref
Ladder network
AVSS
Comparator function select register
(0: A-D converter, 1: Comparator)
A-D control register 1
(Address 1F16
)
(Address 6416
)
A-D control register 0
(Address 1E16
)
Selector
1
Control circuit
Selector
Successive approximation
register
Comparator result register
(Address 6616
)
Address
Address
A-D register 0 (2116
A-D register 1 (2316
A-D register 2 (2516
A-D register 3 (2716
A-D register 4 (2916
)
)
)
)
)
A-D register 0 (2016
A-D register 1 (2216
A-D register 2 (2416
A-D register 3 (2616
A-D register 4 (2816
)
)
)
)
)
Compa-
rator
Decoder
A-D register 5 (2B16
)
A-D register 5 (2A16
)
A-D register 6 (2D16
)
A-D register 6 (2C16
)
A-D register 7 (2F16
)
A-D register 7 (2E16
)
Data bus (odd)
Data bus (even)
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7/ADTRG
Selector
A-D conversion speed selection
φ1
Frequency select
flag 0, 1
0
1
Pf
Pf
2
4
0
f(XIN
)
1/2
φ1
φAD
1/2
Pf
2
1/2
Pf
8
1
Clock source for peripheral
devices select bit
(bit 2 of processor mode register 1)
Clock source select bit
(bit 6 of processor mode register 1)
1/2
Fig. 68 A-D converter block diagram
56
RENESAS [ RENESAS TECHNOLOGY CORP ]
