Interrupt Identification Register (Fiir) - Renesas H8S Family Hardware Manual

Section 15 Serial Communication Interface with FIFO (SCIF)
15.3.7

Interrupt Identification Register (FIIR)

FIIR consists of bits that identify interrupt sources. For details, see table 15.3.
Bit Bit Name
7 FIFOE1
6 FIFOE0

5, 4
3 INTID2
2 INTID1
1 INTID0
0 INTPEND
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REJ09B0403-0100
Initial Value R/W
0 R
0 R
All 0 R
0 R
0 R
0 R
1 R
Description
FIFO Enable 0, 1
These bits indicate the transmit/receive FIFO
setting.
00: Transmit/receive FIFOs disabled
11: Transmit/receive FIFOs enabled
Reserved
These bits are always read as 0. The initial value
should not be changed.
Interrupt ID2, ID1, ID0
These bits Indicate the interrupt of the highest
priority among the pending interrupts.
000: Modem status
001: FTHR empty
010: Receive data ready
011: Receive line status
110: Character timeout (when the FIFO is enabled)
Interrupt Pending
Indicates whether one or more interrupts are
pending.
0: Interrupt pending
1: No interrupt pending