參數(shù)資料
型號(hào)： EM785842M
廠商： ELAN Microelctronics Corp .
英文描述： 8-BIT MICRO-CONTROLLER
中文描述： 8位微控制器
文件頁數(shù)： 27/45頁
文件大?。?/td> 461K
代理商： EM785842M
EM785840/5841/5842
8-bit Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
2004/11/10 V1.2
VII.5 RESET
The RESET can be caused by
(1) Power on reset
(2) WDT timeout. (if enabled and in GREEN or NORMAL mode)
(3) /RESET pin pull low (At P71S = 1).
Once the RESET occurs, the following functions are performed.
The oscillator is running, or will be started.
The Program Counter (R2) is set to all "0".
When power on, the upper 3 bits of R3 and the upper 2 bits of R4 are cleared.
The Watchdog timer and prescaler counter are cleared.
The Watchdog timer is disabled.
VII.6 Wake-up
The controller provided sleep mode for power saving :
SLEEP mode, RA(7) = 0 + "SLEP" instruction
The controller will turn off all the CPU and crystal. Other circuit with power control like key tone control or
PLL control (which has enable register), user has to turn it off by software.
Wake-up from SLEEP mode
(1) WDT time out
(2) External interrupt
(3) /RESET pull low
All these cases will reset controller , and run the program at address zero. The status just like the power on reset.
Be sure to enable circuit at case (1) or (2).
VII.7 Interrupt
RF is the interrupt status register which records the interrupt request in flag bit. IOCF is the interrupt mask
register. Global interrupt is enabled by ENI instruction and is disabled by DISI instruction. When one of the
interrupts (when enabled) generated, will cause the next instruction to be fetched from address 008H. Once in the
interrupt service routine, the source of the interrupt can be determined by polling the flag bits in the RF register.
The interrupt flag bit must be cleared in software before leaving the interrupt service routine and enabling
interrupts to avoid recursive interrupts.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EM785842P 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-BIT MICRO-CONTROLLER
EM78611 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:USB & PS/2 Keyboard Encoder
EM78612 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:Universal Serial Bus Microcontroller
EM78701 制造商:TE Connectivity 功能描述:
EM78800 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-BIT MICRO-CONTROLLER
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