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HT56RU25 Folha de dados(PDF) 54 Page - Holtek Semiconductor Inc

Nome de Peças HT56RU25
Descrição Electrónicos  DAC?갏SO7816, UART, A/D
Download  155 Pages
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RU25 Folha de dados(HTML) 54 Page - Holtek Semiconductor Inc

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Rev. 1.10
54
2014-05-19
Rev. 1.10
55
2014-05-19
HT56RU25
内置
DAC、ISO7816 及 UART 接口的
低功耗
A/D 型智能卡 OTP 单片机
下图显示了与模数转换过程和相关时序的各个阶段。
A/D 转换器没有对应的配置选项,它的功能设定与操作完全由应用过程控制。
由应用过程控制初始化并开始
A/D 转换过程后,单片机的内部硬件就会开始进
行转换,在这个过程中,程序可以继续其它功能。
A/D 转换的时间为 16tAD,其
tAD 为一个 A/D 时钟周期。
t AD C
A/ D c onv er si on ti me
0000 0000B
xxxxB
0000 0101B
0010B
ST AR T
EO CB
PC R7 ~
PC R0
AC S4 ,
AC S2 ~A CS 0
Po we r- on
Re se t
En d of A /D
co nv er si on
1: D ef i ne po rt c on fi gu ra ti on
2: S el ec t a na lo g ch annel
A/ D cl o ck mu st b e f sys, f SY S /2 , f SY S /4 , f SY S /8 , f SY S /1 6 or f SY S /3 2
t A DCS =4 t AD
t AD C = t A DCS +n *t AD ; n= bi t co un t o f A DC re so lu ti on
No te :
St ar t o f A/ D
co nv er si on
Re se t A /D
co nv er te r
A/ D sa mp li ng ti me
t A DCS
0000B
St ar t o f A/ D
co nv er si on
Re se t A /D
co nv er te r
0000 0001B
0001B
St ar t o f A /D
co nv er si on
Re se t A/ D
co nv er te r
En d of A /D
co nv er si on
A/ D sa mp li ng ti me
t A DCS
0000 0000B
xxxxB
A DC mo du le
ON
AD ON B
of f
of f
on
on
t ON 2S T
t AD C
A/ D c onv er si on ti me
AD 转换时序图
编程注意事项
寄存器
ACSR 中的 ADONB 位用于暂停 A/D 转换功能以减少功耗。这一点对电
池供电的系统或手持设备非常重要。
另一个注意事项是,当
A/D 转换通道选择位改变后,A/D 转换器必须重新初始
化。当通道选择位改变后,给寄存器
ADCR 的 START 位一个脉冲即可初始化
A/D 转换器。当选择位全部被清零例外,因为 A/D 转换不需要重新初始化。


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