參數(shù)資料
型號： μPD784046(A)
廠商： NEC Corp.
英文描述： 16 Bit Single Chip Microcontrollers(16 位單片微控制器)
中文描述： 16位單片機(jī)微控制器（16位單片微控制器）
文件頁數(shù)： 35/90頁
文件大小： 613K
代理商： ΜPD784046(A)
μ
PD784044(A), 784046(A)
35
7.5 A/D Converter
The
μ
PD784046(A) has an analog-to-digital (A/D) converter with 16 multiplexed analog input pins (ANI0
through ANI15).
This converter is of successive approximation type. The result of conversion is stored to and retained in 10-
bit A/D conversion result registers (ADCR0-ADCR7). Therefore, high-speed, high-accuracy conversion can be
performed (conversion time: about 13.5
μ
s: f
CLK
= 12.5 MHz).
The A/D conversion operation can be started in the following modes:
Hardware start : Conversion is started by trigger input (INTP4).
Software start : Conversion is started by setting a bit of the A/D converter mode register (ADM).
The A/D converter operates in the following modes:
Scan mode
: Sequentially selects two or more analog input pins to obtain data to be converted from all
the pins.
: Selects only one analog input pin to obtain successive conversion values.
Select mode
The above modes and stopping the conversion are specified by ADM.
When the result of conversion is transferred to ADCRn (n = 0-7), interrupt request INTAD is generated. By
using this interrupt request and by using macro service, the converted value can be successively transferred
to memory.
Figure 7-6. Block Diagram of A/D Converter
Internal bus
Input
selector
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
Input
selector
ANI8
ANI9
ANI10
ANI11
ANI12
ANI13
ANI14
ANI15
Sample & hold circuit
Successive approximation
register (SAR)
Voltage
comparator
Edge
detection
circuit
INTP4
Control
circuit
Conversion
trigger
INTAD
10
Trigger enable
A/D converter mode register
(ADM)
Series resistor string
R/2
R
R/2
AV
REF
AV
SS
8
10
ADCR0
ADCR1
ADCR2
ADCR3
ADCR4
ADCR5
ADCR6
ADCR7
A/D conversion result register
T
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