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參數(shù)資料
| 型號(hào)： | μPD789405 |
| 廠商： | NEC Corp. |
| 英文描述： | 8 Bit Single Chip Microcontrollers(8位單片微控制器) |
| 中文描述： | 8位單片機(jī)微控制器（8位單片微控制器） |
| 文件頁(yè)數(shù)： | 56/128頁(yè) |
| 文件大?。?/td> | 607K |
| 代理商： | ΜPD789405 |
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56
μ
PD789405, 789406, 789407
Figure 5-25. A/D Converter Block Diagram
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
Sample-and-hold circuit
Voltage comparator
Control
circuit
Successive
approximation
register (SAR)
3
A/D conversion result
register (ADCRH)
T
S
AV
SS
INTAD
A/D conveter mode register
A/D input selection register
Internal bus
AV
SS
ADCS
0
FR2
FR1
FR0
0
0
0
ADS2 ADS1 ADS0
AV
REF
AV
DD
(1) Successive approximation register (SAR)
The SAR receives the result of comparing an analog input voltage and a voltage at a voltage tap (comparison
voltage), received from the serial resistor string, starting from the most significant bit (MSB).
Upon receiving all the bits, down to the least significant bit (LSB), that is, upon the completion of A/D
conversion, the SAR sends its contents to the A/D conversion result register.
(2) A/D conversion result register (ADCRH)
The ADCRH holds the result of A/D conversion. Each time A/D conversion ends, the conversion result
received from the successive approximation register is loaded into the ADCRH.
The ADCRH can be manipulated using an 8-bit memory manipulation instruction.
A RESET input clears the ADCRH to 00H.
(3) Sample-and-hold circuit
The sample-and-hold circuit samples consecutive analog inputs from the input circuit, one by one, and sends
them to the voltage comparator. The sampled analog input voltage is held during A/D conversion.
(4) Voltage comparator
The voltage comparator compares an analog input with the voltage output by the serial resistor string.
(5) Serial resistor string
The serial resistor string is configured between AV
REF
and AV
SS
. It generates the reference voltages against
which analog inputs are compared.
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