參數(shù)資料
型號(hào): ST7PL05Y0MB/XXXTRE
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO16
封裝: 0.150 INCH WIDTH, PLASTIC, LEAD FREE, SOP-16
文件頁數(shù): 67/106頁
文件大小: 1990K
代理商: ST7PL05Y0MB/XXXTRE
ST7L05, ST7L09
63/104
SERIAL PERIPHERAL INTERFACE (Cont’d)
Table 16. SPI Register Map and Reset Values
11.4 8-BIT A/D CONVERTER (ADC)
11.4.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 8-bit, successive approximation con-
verter with internal sample and hold circuitry. This
peripheral has up to five multiplexed analog input
channels (refer to device pin out description) that
allow the peripheral to convert the analog voltage
levels from up to five different sources.
The result of the conversion is stored in a 8-bit
Data Register. The A/D converter is controlled
through a Control/Status Register.
11.4.2 Main Features
– 8-bit conversion
– Up to 5 channels with multiplexed input
– Linear successive approximation
– Data register (DR) which contains the results
– Conversion complete status flag
– On/off bit (to reduce consumption)
11.4.3 Functional Description
11.4.3.1 Analog Power Supply
The block diagram is shown in Figure 38.
VDD and VSS are the high and low level reference
voltage pins.
Conversion accuracy may therefore be impacted
by voltage drops and noise in the event of heavily
loaded or badly decoupled power supply lines.
For more details, refer to Section 13 ELECTRICAL
Figure 38. ADC Block Diagram
Address
(Hex.)
Register
Label
76
54321
0
31
SPIDR
Reset Value
MSB
x
xxxxx
x
LSB
x
32
SPICR
Reset Value
SPIE
0
SPE
0
SPR2
0
MSTR
0
CPOL
x
CPHA
x
SPR1
x
SPR0
x
33
SPICSR
Reset Value
SPIF
0
WCOL
0
OVR
0
MODF
00
SOD
0
SSM
0
SSI
0
CH2
CH1
0
EOC SPEED ADON
0
CH0
ADCCSR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
ANALOG
MUX
RADC
CADC
D2
D1
D3
D7
D6
D5
D4
D0
ADCDR
3
fADC
HOLD CONTROL
fCPU
0
1
0
DIV 2
DIV 4
SLOW
bit
(ADCCSR2 Register)
7
0
1
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