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HT46R65 Folha de dados(PDF) 16 Page - Holtek Semiconductor Inc

Nome de Peças HT46R65
Descrição Electrónicos  A/DLCD ?뗥뀵鵝띶뜒?뉑쑛
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R65 Folha de dados(HTML) 16 Page - Holtek Semiconductor Inc

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HT46R65/HT46C65
Rev. 2.20
16
2014-06-06
复位
总共有三种方法会产生初始复位:
·
正常运行时由
RES引脚发生复位。
·
在暂停模式由
RES引脚发生复位。
·
正常运行时由看门狗定时器溢出发生复位。
暂停模式中的看门狗定时器溢出与其它系统复位状况不同,因为看
门狗定时器溢出会执行“热复位”,只有程序计数器
Program Counter 和
堆栈指针
SP 被复位,而系统其它部分都保持原有状态。在其它复位状态
下,某些寄存器不会改变。在初始复位时,大部分寄存器会复位成初始
的状态。通过检测
PDF 和 TO 标志,即可判断出各种不同的复位原因。
TO PDF
复位原因
0
0
上电时
RES发生复位
u
u
正常运行时
RES发生复位
0
1
暂停模式下
RES发生复位
1
u
正常运行时
WDT 溢出
1
1
暂停模式下
WDT 溢出
注:“
u”表示不变
为了保证系统振荡器起振并稳定运行,系统复位
(包括上电复位、WDT 溢出或由 RES端复位)或由暂停
状态唤醒时,系统启动定时器
(SST)提供了一个额外的延迟时间,共 1024 个系统时钟周期。
系统复位时,
SST 会被加在复位延时中;由暂停模式唤醒也会加入 SST 延迟。
系统复位
(包括上电复位、正常运行时 WDT 溢出或由 RES端复位)需要额外增加一个加载掩膜选项
(Option)的时间。
系统复位时各功能单元的状态如下所示:
Program Counter
000H
中断
禁止
预分频器、分频器
清除
WDT、RTC、时基
清除,在主系统复位后,
WDT 开始计数
定时
/计数器
停止
输入
/输出口
输入模式
堆栈指针
SP
指向堆栈顶部
RES
VDD
SST Time-out
Chip Reset
tSST
WDT
HALT
WDT
Time-out
Reset
External
RES
Cold
Reset
Power-on Detection
SST
10-bit Ripple
Counter
OSC1
Warm Reset
复位时序图
复位配置
RES
VDD
100kΩ
10kΩ
0.1µF*
0.01µF*
复位电路
注:“
*”连线应该尽量靠近
RES
引脚,以减小干扰影响


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