參數(shù)資料
型號: MC68HC05BS8FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 58/128頁
文件大小: 752K
代理商: MC68HC05BS8FB
MC68HC05BS8
MOTOROLA
5-1
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
33
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