參數(shù)資料
型號: MC68HC08LT8
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 44/156頁
文件大?。?/td> 1030K
代理商: MC68HC08LT8
System Integration Module (SIM)
MC68HC08LT8 Data Sheet, Rev. 1
44
Freescale Semiconductor
Figure 4-11
.
Interrupt Recognition Example
The LDA opcode is prefetched by both the INT1 and INT2 RTI instructions. However, in the case of the
INT1 RTI prefetch, this is a redundant operation.
NOTE
To maintain compatibility with the M6805 Family, the H register is not
pushed on the stack during interrupt entry. If the interrupt service routine
modifies the H register or uses the indexed addressing mode, software
should save the H register and then restore it prior to exiting the routine.
4.5.1.2 SWI Instruction
The SWI instruction is a non-maskable instruction that causes an interrupt regardless of the state of the
interrupt mask (I bit) in the condition code register.
NOTE
A software interrupt pushes PC onto the stack. A software interrupt does
not push PC – 1, as a hardware interrupt does.
4.5.2 Interrupt Status Registers
The flags in the interrupt status registers identify maskable interrupt sources.
Table 2-1
summarizes the interrupt sources and the interrupt status register flags that they set.
CLI
LDA
INT1
PULH
RTI
INT2
BACKGROUND
ROUTINE
#$FF
PSHH
INT1 INTERRUPT SERVICE ROUTINE
PULH
RTI
PSHH
INT2 INTERRUPT SERVICE ROUTINE
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