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VR4102 Datasheet(PDF) 522 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) 522 Page - NEC

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CHAPTER 26 FIR (FAST IrDA INTERFACE UNIT)
522
26.2.19 MRXF (0x0C00 0070)
Bit
D15
D14
D13
D12
D11
D10
D9
D8
Name
Reserved
Reserved
Reserved
MRXF12
MRXF11
MRXF10
MRXF9
MRXF8
R/W
R
R
R
R/W
R/W
R/W
R/W
R/W
RTCRST
000
00
00
0
Other resets
0
0
0
0
0
0
0
0
Bit
D7D6D5
D4D3
D2D1
D0
Name
MRXF7
MRXF6
MRXF5
MRXF4
MRXF3
MRXF2
MRXF1
MRXF0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RTCRST
000
00
00
0
Other resets
0
0
0
0
0
0
0
0
Bit
Name
Function
D15 to
D13
Reserved
Write 0 when writing. 0 is returned after a read.
D12 to D0
MRXF12 to MRXF0
Specifies receivable maximum frame size.
MRXF
MAX Tx Frame length
0x0000
1 byte
0x0001
2 bytes
::
0x1FFF
2 Kbytes
[Function]
The maximum frame size is stored in this register.
When a 1-frame receive data is transferred to the receive FIFO exceeding the receivable maximum frame size set
by this register, an error occurs even under frame reception to end the current frame reception. This sets bit 1 of the
RXSTS register.
After the receive FIFO is cleared, if the number of received frames is less than 7 frames, it is possible to continue
frame reception.
To receive 8 or more frames, read all the data and frames that are already received from the receive FIFO, then
clear the receive FIFO and restart reception.
When receiving data via the DMA operation, set the transfer size value by the following expression:
DMA receivable capacitance = set value x 7 frames
Caution
The data exceeding the maximum size cannot be transferred to the FIFO.



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