參數(shù)資料
型號： MC68HC705PL4BCDW
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.56 MHz, MICROCONTROLLER, PDSO28
封裝： SOIC-28
文件頁數(shù)： 19/98頁
文件大?。?/td> 1019K
代理商： MC68HC705PL4BCDW
GENERAL RELEASE SPECIFICATION
April 30, 1998
MOTOROLA
INTERRUPTS
MC68HC05PL4
4-2
REV 2.0
NOTE
If more than one interrupt request is pending, the CPU fetches the vector of the
higher priority interrupt rst. A higher priority interrupt does not actually interrupt a
lower priority interrupt service routine unless the lower priority interrupt service
routine clears the I bit.
4.2
INTERRUPT PROCESSING
The CPU does the following actions to begin servicing an interrupt:
Stores the CPU registers on the stack in the order shown in
Sets the I bit in the condition code register to prevent further interrupts
Loads the program counter with the contents of the appropriate interrupt
vector locations as shown in Table 4-1
The return from interrupt (RTI) instruction causes the CPU to recover its register
contents from the stack as shown in Figure 4-1. The sequence of events caused
by an interrupt is shown in the ow chart in Figure 4-2
$0020
(Bottom of RAM)
$0021
$00BE
$00BF
$00C0
(Bottom of Stack)
$00C1
$00C2
Unstacking
Order
n
Condition Code Register
5
1
n+1
Accumulator
4
2
n+2
Index Register
3
n+3
Program Counter (High Byte)
2
4
n+4
Program Counter (Low Byte)
1
5
Stacking
$00FD
Order
$00FE
$00FF
Top of Stack (RAM)
Figure 4-1. Interrupt Stacking Order
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