參數(shù)資料
型號(hào)： VRS550-QAI25
廠商： Electronic Theatre Controls, Inc.
英文描述： VRS550 - 8kB Flash, 256B RAM, 25MHz, 8-Bit MCU VRS560 - 16kB Flash, 256B RAM, 25MHz, 8-Bit MCU
中文描述： VRS550 - 8KB閃存，256B的RAM，25MHz的，8位微控制器VRS560 - 16kB的閃存，256B的RAM，25MHz的，8位微控制器
文件頁(yè)數(shù)： 26/40頁(yè)
文件大?。?/td> 868K
代理商： VRS550-QAI25
VRS550 / VRS560
VERSA
Datasheet Rev 1.1
1134 Ste Catherine Street West, Suite 900, Montreal, Quebec, Canada H3B 1H4
Tel: (514) 871-2447
http://www.goalsemi.com
26
Timer 0 and Timer 1 Interrupt
Both Timer 0 and Timer 1 can be configured to
generate an interrupt when a rollover of the
timer/counter occurs (except Timer 0 in Mode 3).
The TF0 and TF1 flags serve to monitor timer overflow
occurring from Timer 0 and Timer 1. These interrupt
flags are automatically cleared when the interrupt is
serviced.
Timer 2 Interrupt
Timer 2 interrupt can occur if TF2 and/or EXF2 flags
are set to 1 and if the Timer 2 interrupt is enabled.
The TF2 flag is set when a rollover of Timer 2
Counter/Timer occurs. The EXF2 flag can be set by a
1->0 transition on the T2EX pin by the software.
Note that neither flag is cleared by the hardware upon
execution of the interrupt service routine. The service
routine may have to determine whether it was TF2 or
EXF2 that generated the interrupt. These flag bits will
have to be cleared by the software.
Every bit that generates interrupts can either be
cleared or set by the software, yielding the same result
as when the operation is done by the hardware. In
other words, pending interrupts can be cancelled and
interrupts can be generated by the software.
Serial Port Interrupt
The serial port can generate an interrupt upon byte
reception or once the byte transmission is completed.
Those two conditions share the same interrupt vector
and it is up to the interrupt service routine to find out
what caused the interrupt by looking at the serial
interrupt flags RI and TI.
Note that neither of these flags is cleared by the
hardware upon execution of the interrupt service
routine. The software must clear these flags.
Execution of an Interrupt
When the processor receives an interrupt request, an
automatic jump to the desired subroutine occurs. This
jump is similar to executing a branch to a subroutine
instruction: the processor automatically saves the
address of the next instruction on the stack. An internal
flag is set to indicate that an interrupt is taking place,
and then the jump instruction is executed. An interrupt
subroutine must always end with the RETI instruction.
This instruction allows users to retrieve the return
address placed on the stack.
The RETI instruction also allows updating of the
internal flag that will take into account an interrupt with
the same priority.
Interrupt Enable and Interrupt Priority
When the VRS550 / VRS560 is initialized, all interrupt
sources are inhibited by the bits of the IE register being
reset to 0. It is necessary to start by enabling the
interrupt sources that the application requires. This is
achieved by setting bits in the IE register, as discussed
previously.
This register is part of the bit addressable internal
RAM. For this reason, it is possible to modify each bit
individually in one instruction without having to modify
the other bits of the register. All interrupts can be
inhibited by setting EA to 0.
The order in which interrupts are serviced is shown in
the following table:
T
ABLE
20:
I
NTERRUPT
N
ATURAL
P
RIORITY
Interrupt Source
RESET + WDT (Highest Priority)
IE0
TF0
IE1
TF1
RI+TI
TF2+EXF2 (Lowest Priority)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
VRS550-QLC25 制造商:未知廠家 制造商全稱:未知廠家 功能描述:VRS550 - 8kB Flash, 256B RAM, 25MHz, 8-Bit MCU VRS560 - 16kB Flash, 256B RAM, 25MHz, 8-Bit MCU
VRS550-QLI25 制造商:未知廠家 制造商全稱:未知廠家 功能描述:VRS550 - 8kB Flash, 256B RAM, 25MHz, 8-Bit MCU VRS560 - 16kB Flash, 256B RAM, 25MHz, 8-Bit MCU
VRS560 制造商:未知廠家 制造商全稱:未知廠家 功能描述:VRS550 - 8kB Flash, 256B RAM, 25MHz, 8-Bit MCU VRS560 - 16kB Flash, 256B RAM, 25MHz, 8-Bit MCU
VRS560-PAC25 制造商:未知廠家 制造商全稱:未知廠家 功能描述:VRS550 - 8kB Flash, 256B RAM, 25MHz, 8-Bit MCU VRS560 - 16kB Flash, 256B RAM, 25MHz, 8-Bit MCU
VRS560-PAI25 制造商:未知廠家 制造商全稱:未知廠家 功能描述:VRS550 - 8kB Flash, 256B RAM, 25MHz, 8-Bit MCU VRS560 - 16kB Flash, 256B RAM, 25MHz, 8-Bit MCU
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