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FUNCTIONAL DESCRIPTION
2.9 A-D comparator
Table 2.9.1 Relationship between contents of A-D control register 2 and reference voltage "V
A-D control register 2
bit 5
bit 4
bit 3
0
0
0
0
0
0
0
0
0
:
:
:
1
1
1
1
1
1
1
1
1
A-D Control Register 1
b7 b6 b5 b4 b3 b2 b1 b0
Fig. 2.9.2 A-D control register 1 (address 00EE
A-D Control Register 2
b7 b6 b5 b4 b3 b2 b1 b0
Fig. 2.9.3 A-D control register 2 (address 00EF
2-62
bit 2
bit 1
bit 0
0
0
0
0
0
1
0
1
0
:
:
:
1
0
1
1
1
0
1
1
1
A-D control register 1 (AD1) [Address 00EE
B
0
Analog input pin selection
to
bits
2
(ADM0, ADM1, ADM2)
Nothing is assigned. This bit is a write disable bit.
3
When this bit is read out, the value is "0."
Storage bit of comparison
4
result (ADM4)
5
Nothing is assigned. These bits are write disable bits.
to
When these bits are read out, the values are "0."
7
A-D control register 2(AD2) [Address 00EF
B
0
D-A converter set bits
to
(ADC0, ADC1, ADC2,
ADC3, ADC4, ADC5)
5
Nothing is assigned. These bits are write disable bits.
6, 7
When these bits are reed out, the values are " 0."
7220 Group User's Manual
Internal analog voltage
(comparison voltage V
Name
Functions
b2 b1 b0
0
0
0 : A- D1
0
0
1 : A-D2
0
1
0 : A-D3
0
1
1 : A-D4
1
0
0 : A-D5
1
0
1 : A-D6
1
1
0 :
1
1
1 :
0: Input voltage < reference voltage
1: Input voltage > reference voltage
)
16
]
16
Name
Functions
b5
b4
b3
b2
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
)
16
)
ref
1/128V
CC
3/128V
CC
5/128V
CC
:
123/128V
CC
125/128V
CC
127/128V
CC
]
16
After reset R W
0
Do not set.
0
Indeterminate
0
After reset
b1
b0
0
0
0
: 1/128Vcc
0
1
: 3/128Vcc
1
0
: 5/128Vcc
0
1
: 123/128Vcc
1
0
: 125/128Vcc
1
1
: 127/128Vcc
0
"
ref
R W
R —
R W
R —
R W
R W
R —
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