參數(shù)資料
型號： MC68HC11A1VFU2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS Single-Chip Microcontroller
中文描述： 8-BIT, 2 MHz, MICROCONTROLLER, PQFP64
封裝： QFP-64
文件頁數(shù)： 82/158頁
文件大小： 503K
代理商： MC68HC11A1VFU2
MOTOROLA
9-2
RESETS, INTERRUPTS, AND LOW POWER MODES
MC68HC11A8
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
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFF
VECTOR
FETCH
1
E
RESET
PIN
ENABLE RESET PIN
PULL-DOWN
(INTERNAL SIGNAL)
EXTERNAL RESET CASE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFA
FFFB
VECTOR
FETCH
1
E
RPIN
COP WATCHDOG RESET CASE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFE
FFFC
FFFD
VECTOR
FETCH
1
E
RPIN
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.
1
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參數(shù)描述
MC68HC11A1VP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11A1VP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11A8BCFN2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A8BCFU2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
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