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VR4102 Datasheet(PDF) 467 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 467 Page - NEC

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CHAPTER 24 SIU (SERIAL INTERFACE UNIT)
467
24.2.6 SIUIID (0x0C00 0002: Read)
Bit
D7
D6D5
D4D3D2
D1
D0
Name
IIR[7]
IIR[6]
Reserved
Reserved
IIR[3]
IIR[2]
IIR[1]
IIR[0]
R/W
R
RR
RRR
R
R
RTCRST
0
0
0
0
0
0
0
1
Other resets
0
0
0
0
0
0
0
1
Bit
Name
Function
D[7..6]
IIR[7..6]
Becomes 11 when FCR0 = 1
D[5..4]
Reserved
Write 0 when writing. 0 is returned after read.
D[3]
IIR[3]
Pending character timeout interrupt (in FIFO mode)
1 : Pending interrupt
0 : No pending interrupt
D[2..1]
IIR[2..1]
Indicates the priority level of pending interrupt.
See the following table.
D[0]
IIR[0]
Pending interrupts
1 : No pending interrupt
0 : Pending interrupt
This register indicates priority levels for interrupts and existence of pending interrupt.
From highest to lowest priority, these interrupts are receive line status, receive data ready, character timeout,
transmit holding register empty, and modem status.
The contents of IIR[3] bit is valid only in FIFO mode, and it is always 0 in 16550 mode.
IIR[2] bit becomes 1 when IIR[3] bit is set to 1.



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