參數(shù)資料
型號： MC68HC705CT4FB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.048 MHz, MICROCONTROLLER, PQFP44
封裝： QFP-44
文件頁數(shù)： 83/152頁
文件大?。?/td> 964K
代理商： MC68HC705CT4FB
NON-DISCLOSURE
AGREEMENT
REQUIRED
Interrupts
General Release Specification
MC68HC705CT4 — Rev. 2.0
36
Interrupts
MOTOROLA
4.3 CPU Interrupt Processing
Interrupts cause the processor to save register contents on the stack
and to set the interrupt mask (I bit) to prevent additional interrupts. Unlike
RESET, hardware interrupts do not cause the current instruction
execution to be halted, but are considered pending until the current
instruction is complete.
If interrupts are not masked (I bit in the CCR is clear) and the
corresponding interrupt enable bit is set, the processor will proceed with
interrupt processing. Otherwise, the next instruction is fetched and
executed. If an interrupt occurs, the processor completes the current
instruction, stacks the current CPU register states, sets the I bit to inhibit
further interrupts, and finally checks the pending hardware interrupts. If
more than one interrupt is pending after the stacking operation, the
interrupt with the highest vector location shown in Table 4-1 will be
serviced first. The SWI is executed the same as any other instruction,
regardless of the I-bit state.
When an interrupt is to be processed, the CPU fetches the address of
the appropriate interrupt software service routine from the vector table at
locations $1FF4–$1FFF as defined in Table 4-1.
Table 4-1. Vector Address for Interrupts and Reset
Register
Flag
Name
Interrupt
CPU
Interrupt
Vector
Address
N/A
Reset
RESET
$1FFE–$1FFF
N/A
Software
SWI
$1FFC–$1FFD
CMCSR
CMP3
CMP3, External Interrupts*
CMP3/IRQ
$1FFA–$1FFB
TSR
OCF, ICF, TOF
16-bit Timer Interrupts
TIMER
$1FF8–$1FF9
SSSR
SSIF
SSI Interrupt
SSI
$1FF6–$1FF7
CTCSR
TOFE, RTIE
Core Timer Interrupts
TIMER, RTI
$1FF4–$1FF5
* External interrupts include IRQ and PORTC sources.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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