參數(shù)資料
型號: MC68HC05PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 97/165頁
文件大?。?/td> 841K
代理商: MC68HC05PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
INTERRUPTS
MOTOROLA
REV 1.1
4-3
Figure 4-1. Interrupt Processing Flowchart
4.2
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
signal causes the program to vector to its starting address which is specified by the
contents of $FFFE and $FFFF. The I-bit in the condition code register is also set. The
MCU is configured to a known state during this type of reset as described in Section 5.
4.3
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 zero (interrupts enabled), the
N
Y
From
RESET
Is
I-Bit
Set?
Load Interrupt
Vectors to PC
Set I-Bit in CCR
PC -> (SP,SP-1)
X -> (SP-2)
A -> (SP-3)
CC -> (SP-4)
Clear IRQ
Latch
Restore Registers
from Stack
CC, A, X, PC
IRQ
External
Interrupt?
Execute
Instruction
Fetch Next
Instruction
RTI
Instruction
?
SWI
Instruction
?
N
Y
Internal
Interrupt
?
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