參數(shù)資料
型號: MC68HC05C9ACB
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, PDIP42
封裝: SHRINK, PLASTIC, DIP-42
文件頁數(shù): 93/160頁
文件大小: 4128K
代理商: MC68HC05C9ACB
NON-DISCLOSURE
AGREEMENT
REQUIRED
Interrupts
General Release Specification
MC68HC05C9A Rev. 4.0
Interrupts
When the current instruction is complete, the processor checks all
pending hardware interrupts. If interrupts are not masked (CCR I bit
clear) and if the corresponding interrupt enable bit is set, the processor
proceeds with interrupt processing; otherwise, the next instruction is
fetched and executed.
If an external interrupt and a timer, SCI, or SPI interrupt are pending at
the end of an instruction execution, the external interrupt is serviced first.
The SWI is executed the same as any other instruction, regardless of the
I-bit state.
Table 4-1 shows the relative priority of all the possible interrupt sources.
Figure 4-1 shows the interrupt processing flow.
Table 4-1. Vector Addresses for Interrupts and Resets
Function
Source
Local
Mask
Global
Mask
Priority
(1 = Highest)
Vector
Address
Reset
Power-On-Reset
None
1
$3FFE–$3FFF
RESET Pin
COP Watchdog
Software
Interrupt
(SWI)
User Code
None
Same Priority
As Instruction
$3FFC–$3FFD
External
Interrupt
IRQ Pin
Port B Pins
None
I Bit
2
$3FFA–$3FFB
Timer
Interrupts
ICF Bit
ICIE Bit
I Bit
3
$3FF8–$3FF9
OCF Bit
OCIE Bit
TOF Bit
TOIE Bit
SCI
Interrupts
TDRE Bit
TCIE Bit
I Bit
4
$3FF6–$3FF7
TC Bit
RDRF Bit
RIE Bit
OR BIt
IDLE Bit
ILIE Bit
SPI
Interrupts
SPIF Bit
SPIE
I Bit
5
$3FF4–$3FF5
MODF Bit
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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