參數(shù)資料
型號(hào)： UPD784031YGK-BE9
廠商： NEC Corp.
英文描述： 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 16-/8-bit的單晶片微控制器
文件頁數(shù)： 33/88頁
文件大小： 464K
代理商： UPD784031YGK-BE9
33
μ
PD784031Y
7.6 A/D Converter
An analog-to-digital (A/D) converter with eight multiplexed inputs (ANI0 through ANI7) is provided.
This A/D converter is of successive approximation type. The result of conversion is retained by an 8-bit A/D conversion
result register (ADCR). Therefore, high-speed, high-accuracy conversion can be performed (conversion time: approx. 7.5
μ
s at f
CLK
= 16 MHz).
A/D conversion can be started in either of the following two modes:
Hardware start: Conversion is started by trigger input (INTP5).
Software start: Conversion is started by setting a bit of the A/D converter mode register (ADM).
After started, the A/D converter operates in the following modes:
Scan mode: Two or more analog inputs are sequentially selected, and data to be converted are obtained from all the
input pins.
Select mode: Only one analog input pin is used to continuously obtain converted values.
These operation modes and whether starting or stopping the A/D converter are specified by the ADM.
When the result of conversion is transferred to the ADCR, interrupt request INTAD is generated. By using this request
and macro service, the converted values can be successively transferred to the memory.
Figure 7-7. Block Diagram of A/D Converter
Internal bus
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
INTP5
I
Edge
detection
circuit
Conversion trigger
Sample & hold circuit
Voltage comparator
Successive approximation
register (SAR)
Control
Circuit
INTAD
8
Series resistor string
R/2
T
R
R/2
AV
REF1
AV
SS
8
Trigger enable
A/D converter mode
register (ADM)
8
A/D conversion result
register (ADCR)
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