參數(shù)資料
型號(hào)： MC68331CEH16
廠商： Freescale Semiconductor
文件頁數(shù)： 35/84頁
文件大小： 0K
描述： IC MCU 32BIT 16MHZ 132-PQFP
標(biāo)準(zhǔn)包裝： 36
系列： M683xx
核心處理器： CPU32
芯體尺寸： 32-位
速度： 16MHz
連通性： EBI/EMI，SCI，SPI，UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 18
程序存儲(chǔ)器類型： ROMless
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 132-BQFP 緩沖式
包裝： 托盤
產(chǎn)品目錄頁面： 733 (CN2011-ZH PDF)
40
MC68331TS/D
Interrupt requests are sampled on consecutive falling edges of the system clock. Interrupt request input
circuitry has hysteresis. To be valid, a request signal must be asserted for at least two consecutive clock
periods. Valid requests do not cause immediate exception processing, but are left pending. Pending re-
quests are processed at instruction boundaries or when exception processing of higher-priority excep-
tions is complete.
The CPU32 does not latch the priority of a pending interrupt request. If an interrupt source of higher
priority makes a service request while a lower priority request is pending, the higher priority request is
serviced. If an interrupt request of equal or lower priority than the current IP mask value is made, the
CPU does not recognize the occurrence of the request in any way.
3.8.1 Interrupt Acknowledge and Arbitration
Interrupt acknowledge bus cycles are generated during exception processing. When the CPU detects
one or more interrupt requests of a priority higher than the interrupt priority mask value, it performs a
CPU space read from address $FFFFF : [IP] : 1.
The CPU space read cycle performs two functions: it places a mask value corresponding to the highest
priority interrupt request on the address bus, and it acquires an exception vector number from the inter-
rupt source. The mask value also serves two purposes: it is latched into the CCR IP field in order to
mask lower-priority interrupts during exception processing, and it is decoded by modules that have re-
quested interrupt service to determine whether the current interrupt acknowledge cycle pertains to
them.
Modules that have requested interrupt service decode the IP value placed on the address bus at the
beginning of the interrupt acknowledge cycle, and if their requests are at the specified IP level, respond
to the cycle. Arbitration between simultaneous requests of the same priority is performed by means of
serial contention between module interrupt arbitration (IARB) field bit values.
Each module that can make an interrupt service request, including the SIM, has an IARB field in its con-
figuration register. An IARB field can be assigned a value from %0001 (lowest priority) to %1111 (high-
est priority). A value of %0000 in an IARB field causes the CPU to process a spurious interrupt
exception when an interrupt from that module is recognized.
Because the EBI manages external interrupt requests, the SIM IARB value is used for arbitration be-
tween internal and external interrupt requests. The reset value of IARB for the SIM is %1111, and the
reset IARB value for all other modules is %0000. Initialization software must assign different IARB val-
ues in order to implement an arbitration scheme.
Each module must have a unique IARB value. When two or more IARB fields have the same nonzero
value, the CPU interprets multiple vector numbers simultaneously, with unpredictable consequences.
Arbitration must always take place, even when a single source requests service. This point is important
for two reasons: the CPU interrupt acknowledge cycle is not driven on the external bus unless the SIM
wins contention, and failure to contend causes an interrupt acknowledge bus cycle to be terminated by
a bus error, which causes a spurious interrupt exception to be taken.
When arbitration is complete, the dominant module must place an interrupt vector number on the data
bus and terminate the bus cycle. In the case of an external interrupt request, because the interrupt ac-
knowledge cycle is transferred to the external bus, an external device must decode the mask value and
respond with a vector number, then generate bus cycle termination signals. If the device does not re-
spond in time, a spurious interrupt exception is taken.
The periodic interrupt timer (PIT) in the SIM can generate internal interrupt requests of specific priority
at predetermined intervals. By hardware convention, PIT interrupts are serviced before external inter-
rupt service requests of the same priority. Refer to 3.2.7 Periodic Interrupt Timer for more information.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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