TMP86C807NG Datasheet, PDF (132/152 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

12. 8-Bit AD Converter (ADC)
12.1 Configuration
TMP86C807NG
12.2 Control
The AD converter consists of the following four registers:
1. AD converter control register 1 (ADCCR1)
This register selects the analog channels in which to perform AD conversion and controls the AD con-
verter as it starts operating.
2. AD converter control register 2 (ADCCR2)
This register selects the AD conversion time and controls the connection of the DA converter (ladder
resistor network).
3. AD converted value register (ADCDR1)
This register is used to store the digital value after being converted by the AD converter.
4. AD converted value register (ADCDR2)
This register monitors the operating status of the AD converter.
AD Converter Control Register 1
ADCCR1
7
6
(000EH) _ADRS
"0"
5
4
3
"1"
AINDS
2
1
SAIN
0
(Initial value: 0001 0000)
ADRS
AD conversion start
0:
−
1:
Start
AINDS Analog input control
0:
Analog input enable
1:
Analog input disable
0000: AIN0
0001: AIN1
0010: AIN2
0011: AIN3
0100: AIN4
0101: AIN5
R/W
0110: Reserved
SAIN
Analog input channel select
0111:
1000:
Reserved
Reserved
1001: Reserved
1010: Reserved
1011: Reserved
1100: Reserved
1101: Reserved
1110: Reserved
1111: Reserved
Note 1: Select analog input when AD converter stops (ADCDR2<ADBF> = “0”).
Note 2: When the analog input is all use disabling, the ADCCR1<AINDS> should be set to “1”.
Note 3: During conversion, do not perform output instruction to maintain a precision for all of the pins. And port near to analog
input, do not input intense signaling of change.
Note 4: The ADRS is automatically cleared to “0” after starting conversion.
Note 5: Do not set ADCCR1<ADRS> newly again during AD conversion. Before setting ADCCR1<ADRS> newly again, check
ADCDR2<EOCF> to see that the conversion is completed or wait until the interrupt signal (INTADC) is generated (e.g.,
interrupt handling routine).
Note 6: After STOP or SLOW/SLEEP mode are started, AD converter control register 1 (ADCCR1) is all initialized and no data
can be written in this register. Therefore, to use AD converter again, set the ADCCR1 newly after returning to NORMAL1
or NORMAL2 mode.
Note 7: Always set bit 5 in ADCCR1 to “1” and set bit 6 in ADCCR1 to “0”.
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