參數(shù)資料
型號(hào)： uPSD3251
廠商： 意法半導(dǎo)體
英文描述： Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設(shè)備)
中文描述： 閃存可編程系統(tǒng)設(shè)備與8032微控制器內(nèi)核（帶8032微控制器內(nèi)核的閃存可編程系統(tǒng)設(shè)備）
文件頁(yè)數(shù)： 35/128頁(yè)
文件大?。?/td> 1566K
代理商： UPSD3251
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μPSD3251F
INTERRUPT SYSTEM
There are interrupt requests from 10 sources as
follows (see Figure 14, page 36).
I
INT0 External Interrupt
I
2nd USART Interrupt
I
Timer 0 Interrupt
I
I
2
C Interrupt
I
INT1 External Interrupt (or ADC Interrupt)
I
Timer 1 Interrupt
I
USART Interrupt
I
Timer 2 Interrupt
External Int0
–
The INT0 can be either level-active or transition-
active depending on Bit IT0 in register TCON.
The flag that actually generates this interrupt is
Bit IE0 in TCON.
–
When an external interrupt is generated, the
corresponding request flag is cleared by the
hardware when the service routine is vectored
to only if the interrupt was transition activated.
–
If the interrupt was level activated then the inter-
rupt request flag remains set until the requested
interrupt is actually generated. Then it has to de-
activate the request before the interrupt service
routine is completed, or else another interrupt
will be generated.
Timer 0 and 1 Interrupts
–
Timer 0 and Timer 1 Interrupts are generated by
TF0 and TF1 which are set by an overflow of
their respective Timer/Counter registers (except
for Timer 0 in Mode 3).
–
These flags are cleared by the internal hard-
ware when the interrupt is serviced.
Timer 2 Interrupt
–
Timer 2 Interrupt is generated by TF2 which is
set by an overflow of Timer 2. This flag has to be
cleared by the software - not by hardware.
–
It is also generated by the T2EX signal (Timer 2
External Interrupt P1.1) which is controlled by
EXEN2 and EXF2 Bits in the T2CON register.
I
2
C Interrupt
–
The interrupt of the I
2
C is generated by Bit INTR
in the register S2STA.
–
This flag is cleared by hardware.
External Int1
–
The INT1 can be either level active or transition
active depending on Bit IT1 in register TCON.
The flag that actually generates this interrupt is
Bit IE1 in TCON.
–
When an external interrupt is generated, the
corresponding request flag is cleared by the
hardware when the service routine is vectored
to only if the interrupt was transition activated.
–
If the interrupt was level activated then the inter-
rupt request flag remains set until the requested
interrupt is actually generated. Then it has to de-
activate the request before the interrupt service
routine is completed, or else another interrupt
will be generated.
–
The ADC can take over the External INT1 to
generate an interrupt on conversion being com-
pleted
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參數(shù)描述
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