參數(shù)資料
型號(hào)： MC68HC11A8BMP2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封裝： PLASTIC, DIP-48
文件頁數(shù)： 140/158頁
文件大小： 3803K
代理商： MC68HC11A8BMP2
RESETS, INTERRUPTS, AND LOW POWER MODES
MC68HC11A8
9-2
TECHNICAL DATA
9
Figure 9-1 Reset Timing
supply voltage. The power-on circuitry provides a 4064 cycle time delay from the time
of the first oscillator operation. In a system where E = 2 MHz, power on reset lasts
about 2 milliseconds. If the external RESET pin is low at the end of the power-on delay
time, the MCU remains in the reset condition until the RESET pin goes high.
9.1.2.1 CPU
After reset the CPU fetches the restart vector from locations $FFFE and $FFFF
($BFFE and $BFFF if in special bootstrap or special test operating mode) during the
first three cycles, and begins executing instructions. The stack pointer and other CPU
registers are indeterminate immediately after reset; however, the X and I interrupt
mask bits in the condition code register are set to mask any interrupt requests. Also,
the S bit in the condition code register is set to disable the STOP mode.
FFFE
FFFF
VECTOR
FETCH
1
E
RESET
PIN
ENABLE RESET PIN
PULL-DOWN
(INTERNAL SIGNAL)
EXTERNAL RESET CASE
FFFE
FFFA
FFFB
VECTOR
FETCH
1
E
RESET
PIN
COP WATCHDOG RESET CASE
FFFE
FFFC
FFFD
VECTOR
FETCH
1
E
RESET
PIN
CLOCK MONITOR RESET CASE
FFFE
RESET PIN SAMPLED AT THIS TIME. LOW LEVEL INDICATES EXTERNAL RESET. HIGH LEVEL INDICATES CLOCK MONITOR OR COP SYSTEM RESET.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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