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HT46R64 Arkusz danych(PDF) 27 Page - Holtek Semiconductor Inc

Numer części HT46R64
Szczegółowy opis  52/100-pin LQFP
Download  51 Pages
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R64 Arkusz danych(HTML) 27 Page - Holtek Semiconductor Inc

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HT46R64/HT46C64
Rev. 2..10
27
2014-06-06
下面举例说明如何启动和实现 A/D 转换。此例不断扫描 ADCR 寄存器的 EOC 位来判断 A/D 转换是否完成;
例:通过扫描 EOC 位判断 A/D 转换是否完成。
mov
a,00000001B
mov
ACSR,a
; 设置ACSR寄存器,选择fSYS/8做为A/D转换时钟
mov
a,00100000B
; 在ADCR寄存器中设置Port PB0~PB3做为A/D输入
mov
ADCR,a
; 设置AN0进行A/D转换
:
:
:
; 当模拟通道选择位改变后,START信号(0-1-0)必须在10个
:
; 指令周期内发出
Start_conversion:
clr
START
set
START
;
A/D转换复位
clr
START
; 开始A/D转换
Polling_EOC:
sz
EOC
; 扫描ADCR寄存器的 EOC 位判断A/D转换是否完成
jmp
polling_EOC
; 继续扫描
mov
a,ADRH
; 从ADRH寄存器读取A/D转换结果的高位字节
mov
adrh_buffer,a
; 将结果放入用户定义的寄存器中
mov
a,ADRL
; 从ADRL寄存器读取A/D转换结果的低位字节
mov
adrl_buffer,a
; 将结果放入用户定义的寄存器中
:
:
jmp
start_conversion
; 开始下一次 A/D 转换


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