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參數(shù)資料
| 型號： | UPD784225 |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 16/8-BIT單晶片微控制器 |
| 文件頁數(shù)： | 37/92頁 |
| 文件大小： | 687K |
| 代理商： | UPD784225 |
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37
μ
PD784224, 784225, 784224Y, 784225Y
Data Sheet U12376EJ1V0DS00
7.5 A/D Converter
An A/D converter converts an analog input variable into a digital signal. This microcontroller is provided with
an A/D converter with a resolution of 8 bits and 8 channels (ANI0 to ANI7).
This A/D converter is of successive approximation type and the result of conversion is stored to an 8-bit A/D
conversion result register (ADCR).
The A/D converter can be started in the following two ways:
Hardware start
Conversion is started by trigger input (P03).
Software start
Conversion is started by setting the A/D converter mode register.
One analog input channel is selected from ANI0 to ANI7 for A/D conversion. When A/D conversion is started
by means of hardware start, conversion is stopped after it has been completed. When conversion is started by
means of software start, A/D conversion is repeatedly executed, and each time conversion has been completed,
an interrupt request (INTAD) is generated.
Figure 7-7. Block Diagram of A/D Converter
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
Sample & hold circuit
Series resistor string
Voltage comparator
Successive approximation
register (SAR)
A/D conversion result register
(ADCR)
Controller
Edge
detector
INTP3/P03
INTAD
INTP3
AV
SS
AV
DD
Internal bus
S
T
Edge
detector
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