參數(shù)資料
型號： MC68HC705J2S
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS MICROCONTROLLER UNIT
中文描述： 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
封裝： WINDOWED, CERDIP-20
文件頁數(shù)： 31/82頁
文件大?。?/td> 327K
代理商： MC68HC705J2S
MC68HC705J2
Rev. 2
RESETS AND INTERRUPTS
MOTOROLA
5-1
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SECTION 5
RESETS AND INTERRUPTS
This section describes how resets reinitialize the MCU and how interrupts temporarily
change the normal processing sequence.
5.1 Resets
A reset immediately stops the operation of the instruction being executed. A reset
initializes certain control bits to known conditions and loads the program counter with
a user-defined reset vector address. The following conditions produce a reset:
Initial power-up (power-on reset)
A logical zero applied to the RESET pin (external reset)
Timeout of the COP timer (COP reset)
An opcode fetch from an address not in the memory map (illegal address reset)
A reset does the following things to reinitialize the MCU:
Clears all implemented data direction register bits so that the corresponding
I/O pins are inputs
Loads the stack pointer with $FF
Sets the interrupt mask, inhibiting interrupts
Clears the TOFE and RTIE bits in the timer control and status register
Clears the STOP latch, enabling the CPU clocks
Clears the WAIT latch, waking the CPU from the WAIT mode
Loads the program counter with the user-defined reset vector
5.1.1 Power-On Reset
A positive transition on the V
DD
pin generates a power-on reset. The power-on reset
is strictly for power-up conditions and cannot be used to detect drops in power supply
voltage.
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