参数资料
型号: MC68HC705P9CS
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
封装: CERDIP-28
文件页数: 126/160页
文件大小: 2208K
代理商: MC68HC705P9CS
Resets and Interrupts
Technical Data
MC68HC705P9 — Rev. 4.0
68
Resets and Interrupts
MOTOROLA
5.2.3 COP Watchdog Reset
A timeout of the COP watchdog generates a COP reset. The COP
watchdog is part of a software error detection system and must be
cleared periodically to start a new timeout period. To clear the COP
watchdog and prevent a COP reset, write a logic zero to bit 0 (COPC) of
the COP register at location $1FF0.
5.3 Low-Voltage Protection
A drop in power supply voltage below the minimum operating VDD
voltage is called a brownout condition. A brownout while the MCU is in a
non-reset state can corrupt MCU operation and necessitate a power-on
reset to resume operation.
The best protection against brownout is an undervoltage sensing circuit
that pulls the RESET pin low when it detects a low-power supply voltage.
The undervoltage sensing circuit may be made of discrete components
or an integrated circuit can be used.
For information about brownout and the COP watchdog, see Section 8.
5.4 Interrupts
The following sources can generate interrupts:
SWI instruction
IRQ/VPP pin
Capture/compare timer
An interrupt temporarily stops normal program execution to process a
particular event. An interrupt does not stop the operation of the
instruction being executed, but takes effect when the current instruction
completes its execution. Interrupt processing automatically saves the
CPU registers on the stack and loads the program counter with a user-
defined interrupt vector address.
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For More Information On This Product,
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