UPSD3422_06 Datasheet, PDF (56/293 Pages) STMicroelectronics – Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic

Interrupt system
uPSD34xx
13.1.8
13.1.9
PCA interrupt
The PCA has eight interrupt sources, which are logically ORed together when interrupting
the MCU.The ISR must read the flag bits to determine the cause of the interrupt.
● Each of the six TCMs can generate a "match or capture" interrupt on flag bits OFV5..0
respectively.
● Each of the two 16-bit counters can generate an overflow interrupt on flag bits INTF1
and INTF0 respectively.
Tables 17 through Table 20 on page 58 have detailed bit definitions of the interrupt system
SFRs.
USB Interrupt
The USB interrupt has multiple sources. The ISR must read the USB Interrupt Flag
Registers (UIF0-3) to determine the source of the interrupt.
The USB interrupt can be activated by any of the following four group of interrupt sources:
● Global: the interrupt flag is set when any of the following events occurs: USB Reset,
USB Suspend, USB Resume, and End of Packet;
● In FIFO: the interrupt flag is set when any of the End Point In FIFO becomes empty;
● Out FIFO: the interrupt flag is set when any of the End Point Out FIFO becomes full;
and
● In FIFO NAK: the interrupt flag is set when any of the End Point In FIFO is not ready for
an IN (in-bound) packet.
Table 17.
Bit 7
EA
IE: interrupt enable register (SFR A8h, reset value 00h)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
–
ET2
ES0
ET1
EX1
ET0
Bit 0
EX0
Bit
Symbol
R/W
Function
Global disable bit. 0 = All interrupts are disabled. 1 = Each
7
EA
R,W interrupt source can be individually enabled or disabled by
setting or clearing its enable bit.
Do not modify this bit. It is used by the JTAG debugger for
6
–
R,W instruction tracing. Always read the bit and write back the
same bit value when writing this SFR.
5⁽¹⁾
ET2
R,W Enable Timer 2 Interrupt
4⁽¹⁾
ES0
R,W Enable UART0 Interrupt
3⁽¹⁾
ET1
R,W Enable Timer 1 Interrupt
2⁽¹⁾
EX1
R,W Enable External Interrupt INT1
1⁽¹⁾
ET0
R,W Enable Timer 0 Interrupt
0⁽¹⁾
EX0
R,W Enable External Interrupt INT0
Note: 1 1 = Enable Interrupt, 0 = Disable Interrupt
56/293