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UPSD3422 Datasheet(PDF) 63 Page - STMicroelectronics

Part # UPSD3422
Description  Turbo Plus series Fast Turbo 8032 MCU with USB and programmable logic
PDF  300 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD3422 Datasheet(HTML) 63 Page - STMicroelectronics

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Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
UPSD3422, UPSD3433, UPSD3434, UPSD3454
Interrupt system
63/300
If an interrupt flag is not cleared after servicing the interrupt, an unwanted interrupt will occur
upon exiting the ISR.
After the interrupt is serviced, the last instruction executed by the ISR is RETI. The RETI
informs the MCU that the ISR is no longer in progress and the MCU pops the top two bytes
from the stack and loads them into the PC. Execution of the interrupted program continues
where it left off.
Note:
An ISR must end with a RETI instruction, not a RET. An RET will not inform the interrupt
control system that the ISR is complete, leaving the MCU to think the ISR is still in progress,
making future interrupts impossible.
Table 17.
Interrupt summary
Interrupt
source
Polling
priority
Vector
addr
Flag bit name
(SFR.bit
position)
1 = Intr pending
0 = No interrupt
Flag bit
auto-
cleared by
hardware?
Enable bit name
(SFR.bit
position)
1 = Intr Enabled
0 = Intr Disabled
Priority bit name
(SFR.bit
position)
1= High Priority
0 = Low Priority
Reserved 0 (high) 0063h
–
–
–
–
External
Interrupt
INT0
1
0003h
IE0 (TCON.1)
Edge - Yes
Level - No
EX0 (IE.0)
PX0 (IP.0)
Timer 0
Overflow
2
000Bh
TF0 (TCON.5)
Yes
ET0 (IE.1)
PT0 (IP.1)
External
Interrupt
INT1
3
0013h
IE1 (TCON.3
Edge - Yes
Level - No
EX1 (IE.2)
PX1 (IP.2)
Timer 1
Overflow
4
001Bh
TF1 (TCON.7)
Yes
ET1 (IE.3)
PT1 (IP.3)
UART0
5
0023h
RI (SCON0.0)
TI (SCON0.1)
No
ES0 (IE.4)
PS0 (IP.4)
Timer 2
Overflow
or TX2
Pin
6
002Bh
TF2 (T2CON.7)
EXF2
(T2CON.6)
No
ET2 (IE.5)
PT2 (IP.5)
SPI
7
0053h
TEISF, RORISF,
TISF, RISF
(SPISTAT[3:0])
Yes
ESPI (IEA.6)
PSPI (IPA.6)
USB
8
0033h
– (1)
1.
See USB interrupt flag registers UIF0-3.
No
EUSB (IEA.0)
PUSB (IPA.0)
I2C
9
0043h
INTR (S1STA.5)
Yes
EI2C (IEA.1)
PI2C (IPA.1)
ADC
10
003Bh
AINTF
(ACON.7)
No
EADC (IEA.7)
PADC (IPA.7)
PCA
11
005Bh
OFVx, INTFx
(PCASTA[0:7])
No
EPCA (IEA.5)
PPCA (IPA.5)
UART1
12 (low) 004Bh
RI (SCON1.0)
TI (SCON1.1)
No
ES1 (IEA.4)
PS1 (IPA.4)
Obsolete
Product(s)
- Obsolete
Product(s)



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