ST72T311 ST Microelectronics, ST72T311 Datasheet - Page 79

• Manufacturer Part Number: ST72T311
• Description: 8-BIT MCU WITH 8 TO 16K OTP/EPROM
• Manufacturer: ST Microelectronics

8-BIT A/D CONVERTER (ADC) (Cont’d)
4.6.6 Register Description
CONTROL/STATUS REGISTER (CSR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7 = COCO Conversion Complete
This bit is set by hardware. It is cleared by soft-
ware reading the result in the DR register or writing
to the CSR register.
0: Conversion is not complete.
1: Conversion can be read from the DR register.
Bit 6 = Reserved. Must always be cleared.
Bit 5 = ADON A/D converter On
This bit is set and cleared by software.
0: A/D converter is switched off.
1: A/D converter is switched on.
Note: a typically 30 s delay time is necessary for
the ADC to stabilize when the ADON bit is set.
Bit 4 = Reserved. Forced by hardware to 0.
Bit 3 = Reserved. Must always be cleared.
Bits 2-0: CH[2:0] Channel Selection
These bits are set and cleared by software. They
select the analog input to convert.
Table 21. ADC Register Map
COCO
Reset Value
Reset Value
7
Address
(Hex.)
70
71
-
ADON
Register
Name
CSR
DR
0
-
COCO
AD7
7
0
0
CH2
AD6
CH1
6
0
0
-
CH0
0
ADON
AD5
5
0
0
Table 20. Channel Selection
*IMPORTANT NOTE: The number of pins AND
the channel selection vary according to the device.
REFER TO THE DEVICE PINOUT).
DATA REGISTER (DR)
Read Only
Reset Value: 0000 0000 (00h)
Bit 7:0 = AD[7:0] Analog Converted Value
This register contains the converted analog value
in the range 00h to FFh.
Reading this register reset the COCO flag.
AD7
7
AD4
4
0
0
0
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
Pin*
AD6
AD5
AD3
3
0
0
-
CH2
AD4
0
0
0
0
1
1
1
1
CH2
AD2
2
0
0
ST72E311 ST72T311
AD3
CH1
0
0
1
1
0
0
1
1
AD2
AD1
CH1
1
0
0
AD1
79
CH0
0
1
0
1
0
1
0
1
CH0
AD0
79/100
0
0
0
AD0
0