參數(shù)資料
型號: MC68HC05F4FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 112/130頁
文件大小: 2089K
代理商: MC68HC05F4FB
MOTOROLA
8-8
MC68HC05F4
RESETS AND INTERRUPTS
8
8.2.4
Hardware controlled interrupt sequence
The following three functions (RESET, STOP, and WAIT) are not in the strictest sense interrupts.
However, they are acted upon in a similar manner. Flowcharts for STOP and WAIT are shown in
RESET: A reset condition causes the program to vector to its starting address, which is contained
in memory locations $3FFE (MSB) and $3FFF (LSB). The I-bit in the condition code register is
also set, to disable interrupts.
STOP: The STOP instruction causes the oscillator to be turned off and the processor to ‘sleep’
until an external interrupt (IRQ), a low voltage interrupt (LVI) or a keyboard interrupt occurs, or the
device is reset.
WAIT: The WAIT instruction causes all processor clocks to stop, but leaves the timer clocks
running. This ‘rest’ state of the processor can be cleared by reset, an external interrupt (IRQ), a
keyboard interrupt, a timer interrupt (core or 16-bit) or an LVI interrupt. There are no special WAIT
vectors for these interrupts.
TPG
78
05F4Book Page 8 Tuesday, August 5, 1997 1:10 pm
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