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參數(shù)資料
| 型號(hào)： | UPD78218AGC |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁(yè)數(shù)： | 22/66頁(yè) |
| 文件大小： | 510K |
| 代理商： | UPD78218AGC |
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22
μ
PD78217A, 78218A
3.5
A/D CONVERTER
The
μ
PD78217A/78218A incorporate the analog/digital (A/D) converter with 8-channel multiplexed analog input
(AN0 to AN7).
The conversion method used is successive approximation. After the A/D conversion results are generated, they
are held in the 8-bit A/D conversion result register (ADCR), which may allow high-speed and high-precision
conversion (conversion time: Approx. 30
μ
s; at 12-MHz operation).
The following two modes are available for starting A/D conversion:
Hardware start : Starts conversion by trigger input (INTP5)
Software start
: Starts conversion by the A/D converter mode register (ADM) bit setting
The following two modes of operation after starting are available:
Scan mode
Select mode : The analog input is fixed at one pin and a continuous conversion value is obtained.
: Multiple analog input are selected sequentially and conversion data is obtained from all pins.
The above modes and the conversion operation are all stopped by ADM.
If the conversion result is transferred to the ADCR, an interrupt request INTAD is generated, (except in software
start select mode). Therefore, the conversion value can be transferred to memory continuously using macro service
(See section
4.1.3 “Macro Service”
).
Table 3-3 INTAD Generation Mode
Scan Mode
Select Mode
Hardware start
Software start
–––
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