
I-96
EPSON
S1C62740 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (A/D Converter)
Table 4.12.4 shows the A/D converter control bit and its address.
Control of the A/D
converter
Table 4.12.4 Control bits of A/D converter
*1 Initial value at the time of initial reset
*5 Constantly "0" when being read
*2 Not set in the circuit
*6 Refer to main manual
*3 Undefined
*7 Page switching in I/O memory is not necessary
*4 Reset (0) immediately after being read
Address
Comment
Register
D3
D2
D1
D0
Name
Init
1
0
*1
C4H
IAD
R
0
IAD
–
0
Yes
No
0
*2
*5
*4
C8H
EIPT
0
EIAD
EISIO
EIPT
0
Unused
Interrupt mask register (A/D converter)
Interrupt mask register (serial interface)
Interrupt mask register (programmable timer)
Enable
Mask
EISIO
EIAD
0
*2
*5
*7
R/W
Unused
Interrupt factor flag (A/D converter)
R
F0H
VRON
R/W
GNDON1
GNDON0
VRAON
VRON
0
GND circuit On/Off and mode selection
0: Off, 1: On1, 2: On2, 3: On3
VR output voltage adjustment On/Off
VR circuit On/Off
On
Off
VRAON
GNDON0
GNDON1
ADRS0
R
0
ADRS1
ADRS0
–
0
ADRS1
0
F3H
*2
*5
F6H
AI4
R
ADON
0
AI4
0
–
0
On
Off
0
ADON
*2
*5
F7H
AD0
AD3
AD2
AD1
AD0
0
AD1
AD2
AD3
F8H
AD4
AD7
AD6
AD5
AD4
0
AD5
AD6
AD7
F9H
AD8
AD11
AD10
AD9
AD8
0
AD9
AD10
AD11
*5
FAH
AD12
0
ADP
AD12
–
0
(+)
(-)
ADP
0
*2
R
FBH
IDR
R
0
IDR
–
0
Invalid
Valid
0
*2
*5
R
Unused
Input voltage polarity
A/D converter count data (MSB)
Unused
Reading data status
Unused
A/D converter resolution selection
0: 6400, 1: 3200, 2: 1600, 3: 800
A/D converter clear and On/Off
Unused
Analog input terminal AI4 On/Off
0
R/W
R
A/D converter count data
AI0
AI3
AI2
AI1
AI0
0
On
Off
AI1
AI2
AI3
F5H
Analog input terminal AI3 On/Off
Analog input terminal AI2 On/Off
Analog input terminal AI1 On/Off
Analog input terminal AI0 On/Off
AIS0
R/W
AIS3
AIS2
AIS1
AIS0
0
Resistor
Differ. V
V(to GND)
AIS1
AIS2
AIS3
F4H
AI4/AI3 mode selection
AI4/AI2 mode selection
AI3/AI2 mode selection
AI1/AI0 mode selection
R/W
A/D converter count data
LSB
R/W
A/D converter count data
*6