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HT56RU25 Folha de dados(PDF) 85 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) 85 Page - Holtek Semiconductor Inc

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HT56RU25
内置
DAC、ISO7816 及 UART 接口的
低功耗
A/D 型智能卡 OTP 单片机
Rev. 1.10
84
2014-05-19
Rev. 1.10
85
2014-05-19
编程注意事项
通过禁止中断使能位,可以屏蔽中断请求,然而,一旦中断请求标志位被设定,
它们会被保留在
INTC0、INTC1、INTC2、MFIC0 和 MFIC1 中断控制寄存器内,
直到相应的中断服务子程序执行或请求标志位被软件指令清除。
多功能中断中所含中断相应程序执行时,多功能中断请求标志可以自动清零,
但各自的请求标志需在应用程序中手动清除。
建议在中断服务子程序中不要使用“
CALL 子程序”指令。中断通常发生在不
可预料的情况或是需要立刻执行的某些应用。假如只剩下一层堆栈且没有控制
好中断,当“
CALL 子程序”在中断服务子程序中执行时,将破坏原来的控制
序列。
所有中断在休眠或空闲模式下都具有唤醒功能,当中断请求标志发生由低到高
的转变时都可产生唤醒功能。若要避免相应中断产生唤醒动作,在单片机进入
休眠或空闲模式前需先将相应请求标志置为高。
当进入中断服务程序,系统仅将程序计数器的内容压入堆栈,如果中断服务程
序会改变状态寄存器或其它的寄存器的内容而破坏控制流程,应事先将这些数
据保存起来。若要从中断子程序中返回,可执行
RET 或 RETI 指令。除了能返
回至主程序外,
RETI 指令还能自动设置 EMI 位为高,允许进一步中断。RET
指令只能返回至主程序,清除
EMI 位,除能进一步中断。


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