参数资料
型号: ST72T141K2B1XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数: 15/132页
文件大小: 823K
代理商: ST72T141K2B1XXX
ST72141K
111/132
8-BIT A/D CONVERTER (ADC) (Cont’d)
8.5.6 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 typical 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 44. 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 resets the COCO flag.
Table 45. ADC Register Map and Reset Values
70
COCO
-
ADON
0
-
CH2
CH1
CH0
Pin*
CH2
CH1
CH0
AIN0
0
AIN1
0
1
AIN2
0
1
0
AIN3
0
1
AIN4
1
0
AIN5
1
0
1
AIN6
1
0
AIN7
1
70
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
Address
(Hex.)
Register
Label
765
4
321
0
0070h
ADCDR
Reset Value
IS11
0
IS10
0
MCO
0
IS21
0
IS20
0
CP1
0
CP0
0
SMS
0
0071h
ADCCSR
Standard
Reset Value
COCO
00
ADON
000
CH2
0
CH1
0
CH0
0
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