参数资料
型号: MC68HC05BS8FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, QFP-44
文件页数: 58/128页
文件大小: 9691K
代理商: MC68HC05BS8FB
MC68HC05BS8
RESETS AND INTERRUPTS
5
RESETS AND INTERRUPTS
The section describes the reset and interrupt functions available on the MC68HC05BS8.
5.1
RESETS
The MC68HC05BS8 can be reset in four ways:
by the initial power-on reset function, (POR)
by an active low input to the RESET pin, (RESET)
by a COP watchdog timer reset, (COPR)
and by a Low Voltage Reset, (LVR)
Any of these resets will cause the program to go to its starting address, specied by the contents
of memory locations $3FFE and $3FFF, and cause the interrupt mask (I-bit) of the Condition Code
register to be set.
5.1.1
Power-On Reset (POR)
The power-on reset occurs when a positive transition is detected on the supply voltage, VDD. The
power-on reset is used strictly for power-up conditions, and should not be used to detect any drops
in the power supply voltage. There is no provision for a power-down reset. The power-on circuitry
provides for a 4064 tCYC delay from the time that the oscillator becomes active. If the external
RESET pin is low at the end of the 4064 tCYC time out, the processor remains in the reset condition
until RESET goes high. The user must ensure that VDD has risen to a point where the MCU can
operate properly prior to the time the 4064 POR cycles have elapsed. If there is doubt, the external
RESET pin should remain low until such time that VDD has risen to the minimum operating voltage
specied.
TPG
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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