參數(shù)資料
型號(hào)： UPD784916B
廠商： NEC Corp.
英文描述： 16-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 16位單晶片微控制器
文件頁數(shù)： 40/86頁
文件大?。?/td> 384K
代理商： UPD784916B
μ
PD784915B, 784916B
40
3.8 A/D Converter
The
μ
PD784916B has an analog-to-digital (A/D) converter with 12 multiplexed analog inputs (ANI0 to ANI11).
This A/D converter is of successive approximation type, and the conversion result is held by an 8-bit A/D conversion
result register (ADCR) (conversion time: 10
μ
s at f
CLK
= 8 MHz).
A/D conversion can be started in the following two modes:
Hardware start: Conversion is started by a hardware trigger
Note
.
Software start : Conversion is started by setting the A/D conversion mode register (ADM).
After conversion has been started, the A/D converter operates in the following modes:
Scan mode : Sequentially selects more than one analog input to obtain data to be converted from all the pins.
Select mode: Use only one pin for analog input to obtain successive data.
When the conversion result is transferred to ADCR, interrupt request INTAD is generated. By processing this
interrupt with the macro service, the conversion result can be successively transferred to memory.
A mode in which starting A/D conversion of the next pin is kept pending until the value of ADCR is read is also
available. When this mode is used, reading the conversion result by mistake when timing is shifted because an
interrupt is disabled can be prevented.
Note
A hardware trigger can be one of the following coincidence signals, one of which is selected by the trigger
source select register 1 (TRGS1):
TM0-CR01 coincidence signal
TM0-CR02 coincidence signal
TM1-CR13 coincidence signal
TM5-CR50 coincidence signal
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