M37221M4H_15 Datasheet, PDF (52/114 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP
A-D Control Register 1
b7 b6 b5 b4 b3 b2 b1 b0
A-D control register 1 (AD1) [Address 00EE16]
B
Name
0 Analog input pin selection
to bits
2 (ADM0 to ADM2)
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 : Do not set
1 1 1 : Do not set
After reset R W
0 _RW
3 This bit is a write disable bit.
When this bit is read out, the value is “0.”
0 _R—
4 Storage bit of comparison
result (ADM4)
0: Input voltage < reference voltage Indeterminate _{R —}
1: Input voltage > reference voltage
5 _{Nothing is assigned. This bits are write disable bits.}
to _{When these bits are read out, the values are “0.”}
7
0 _R—
Fig. 8.8.2 A-D Control Register 1
A-D Control Register 2
b7 b6 b5 b4 b3 b2 b1 b0
A-D control register 2 (AD2) [Address 00EF16]
B
Name
0 D-A converter set bits
to (ADC0 to ADC5)
5
Functions
b5 b4 b3 b2 b1 b0
0 0 0 0 0 0 : 1/128Vcc
0 0 0 0 0 1 : 3/128Vcc
0 0 0 0 1 0 : 5/128Vcc
After reset R W
0
RW
1 1 1 1 0 1 : 123/128Vcc
1 1 1 1 1 0 : 125/128Vcc
1 1 1 1 1 1 : 127/128Vcc
6, 7 Nothing is assigned. These bits are write disable bits.
When these bits are reed out, the values are “ 0.”
0
R—
Fig. 8.8.3 A-D Control Register 2
Rev.1.00 Oct 01, 2002 page 50 of 110
REJ03B0134-0100Z