參數(shù)資料
型號(hào)： M44C890
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Low-Current Microcontroller for Wireless Communication
中文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝： SSO-20
文件頁(yè)數(shù)： 10/63頁(yè)
文件大?。?/td> 503K
代理商： M44C890
M44C890
M44C090
Rev.A4, 14-Dec-01
10 (63)
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INT5 active
INT2 pending
SWI0
INT2
RTI
INT5
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INT3
RTI
RTI
RTI
INT7
Time
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Main /
Main /
94 8978
Figure 8. Interrupt handling
Interrupt Processing
For processing the eight interrupt levels, the MARC4
includes an interrupt controller with two 8-bit wide
”
interrupt pending
”
and
”
interrupt active
”
registers. The
interrupt controller samples all interrupt requests during
every non-I/O instruction cycle and latches these in the
interrupt pending register. If no higher priority interrupt
is present in the interrupt active register, it signals the
CPU to interrupt the current program execution. If the
interrupt enable bit is set, the processor enters an interrupt
acknowledge cycle. During this cycle a short call
(SCALL) instruction to the service routine is executed
and the current PC is saved on the return stack. An
interrupt service routine is completed with the RTI
instruction. This instruction sets the interrupt enable flag,
resets the corresponding bits in the interrupt
pending/active register and fetches the return address
from the return stack to the program counter. When the
interrupt enable flag is reset (triggering of interrupt
routines are disabled), the execution of new interrupt
service routines is inhibited but not the logging of the
interrupt requests in the interrupt pending register. The
execution of the interrupt is delayed until the interrupt
enable flag is set again. Note that interrupts are only lost
if an interrupt request occurs while the corresponding bit
in the pending register is still set (i.e., the interrupt service
routine is not yet finished).
It should also be noted that automatic stacking of the RBR
is not carried out by the hardware and so if ROM banking
is used, the RBR must be stacked on the expression stack
by the application program and restored before the RTI.
After a master reset (power-on, brown-out or watchdog
reset), the interrupt enable flag and the interrupt pending
and interrupt active register are all reset.
Interrupt Latency
The interrupt latency is the time from the occurrence of
the interrupt to the interrupt service routine being
activated. In MARC4 this is extremely short (taking
between 3 to 5 machine cycles depending on the state of
the core).
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