参数资料
型号: MC68HC05SR3FB
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, PQFP44
封装: QFP-44
文件页数: 35/96页
文件大小: 3143K
代理商: MC68HC05SR3FB
Freescale
5-4
MC68HC05SR3
RESETS AND INTERRUPTS
5
Figure 5-2 Hardware Interrupt Processing Flowchart
From RESET
Is I-bit Set?
Fetch Next
Y
N
IRQ External
Y
N
Interrupt ?
Timer Interrupt?
Y
N
Keyboard Interrupt?
Y
N
Instruction
Execute
Instruction
Clear
External Interrupt
Request Latch
PC → (SP, SP–1)
Set I-bit in CCR
Load Interrupt
Restore Registers
from Stack
CC, A, X, PC
IRQ2 External
Y
N
Interrupt ?
X → (SP–2)
A → (SP–3)
CC→ (SP–4)
Vectors to
SWI Instruction?
Y
N
RTI Instruction?
Y
N
Program Counter
TPG
38
05SR3.Book Page 4 Thursday, August 4, 2005 1:08 PM
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