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XR16M890
UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
REV. 1.0.0
3.4
Interrupt Status Register (ISR) - Read-Only
The UART provides multiple levels of prioritized interrupts to minimize external software interaction. The
Interrupt Status Register (ISR) provides the user with six interrupt status bits. Performing a read cycle on the
ISR will give the user the current highest pending interrupt level to be serviced, others are queued up to be
serviced next. No other interrupts are acknowledged until the pending interrupt is serviced. The Interrupt
Source Table, Table 8 , shows the data values (bit 0-5) for the interrupt priority levels and the interrupt sources
associated with each of these interrupt levels.
3.4.1
Interrupt Generation:
? LSR is by any of the LSR bits 1, 2, 3 and 4.
? RXRDY is by RX trigger level.
? RXRDY Time-out is by a 4-char plus 12 bits delay timer.
? TXRDY is by TX trigger level or TX FIFO empty.
? MSR is by any of the MSR bits 0, 1, 2 and 3.
? Receive Xon/Xoff/Special character is by detection of a Xon, Xoff or Special character.
? CTS# is when the remote transmitter toggles the input pin (from LOW to HIGH) during auto CTS flow control.
? RTS# is when its receiver toggles the output pin (from LOW to HIGH) during auto RTS flow control.
? Wakeup interrupt is generated when the M890 wakes up from the sleep mode.
? GPIO interrupt is generated when a GPIO input has been asserted (polarity selected by GPIOINV register)
3.4.2
Interrupt Clearing:
? LSR interrupt is cleared by a read to the LSR register.
? RXRDY interrupt is cleared by reading data until FIFO falls below the trigger level.
? RXRDY Time-out interrupt is cleared by reading RHR.
? TXRDY interrupt is cleared by a read to the ISR register or writing to THR.
? MSR interrupt is cleared by a read to the MSR register.
? Xon or Xoff interrupt is cleared by a read to the ISR register.
? Special character interrupt is cleared by a read to ISR register or after next character is received.
? RTS# and CTS# flow control interrupts are cleared by a read to the MSR register.
? Wakeup interrupt is cleared by a read to ISR register.
? GPIO interrupt is cleared by a read to the GPIOLVL register
]
T ABLE 8: I NTERRUPT S OURCE AND P RIORITY L EVEL
P RIORITY
ISR R EGISTER S TATUS B ITS
S OURCE OF INTERRUPT
L EVEL
B IT -5
B IT -4
B IT -3
B IT -2
B IT -1
B IT -0
1
2
3
4
5
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
1
1
0
0
1
0
0
1
0
0
0
0
0
0
LSR (Receiver Line Status Register)
RXRDY (Receive Data Time-out)
RXRDY (Received Data Ready)
TXRDY (Transmit Ready)
MSR (Modem Status Register)
32
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