参数资料
型号: MC68HC05K3CP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP16
封装: PLASTIC, DIP-16
文件页数: 70/132页
文件大小: 2612K
代理商: MC68HC05K3CP
Technical Data
MC68HC05K3 — Rev. 5
Interrupts
Interrupts
Figure 4-2. Interrupt Stacking Order
4.4 Reset Interrupt Sequence
The reset function is not in the strictest sense an interrupt; however, it is
acted upon in a similar manner. A low-level input on the RESET pin or
an internally generated reset (RST) signal causes the program to vector
to its starting address, which is specified by the contents of memory
locations $03FE and $03FF. The I bit in the condition code register also
is set. The MCU is configured to a known state during this type of reset,
as described in Section 5. Resets.
4.5 Software Interrupt (SWI)
The SWI is an executable instruction and a non-maskable interrupt since
it is executed regardless of the state of the I bit in the CCR. If the I bit
is 0 (interrupts enabled), the SWI instruction executes after interrupts
that were pending before the SWI was fetched or before interrupts
generated after the SWI was fetched. The interrupt service routine
address is specified by the contents of memory locations $03FC and
$03FD.
CONDITION CODE REGISTER
1
PCH
0
ACCUMULATOR
INDEX REGISTER
PCL
R
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T
U
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N
DECREASING
MEMORY
ADDRESSES
INCREASING
MEMORY
ADDRESSES
UNSTACK
STACK
I
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T
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R
U
P
T
0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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ARCHIVED
BY
FREESCALE
SEMICONDUCT
OR,
INC.
2006
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