r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1150
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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22. Serial I/O with FIFO (SIOF)
22.3.9
SIFCTR is a 16-bit readable/writable register that indicates the area available for the
transmit/receive FIFO transfer.
Rev.1.00 Jan. 10, 2008 Page 1120 of 1658
REJ09B0261-0100
Initial value:
Bit
15 to 13 TFWM[2:0]
12 to 8
R/W:
BIt:
FIFO Control Register (SIFCTR)
Bit Name
TFUA[4:0]
R/W
15
0
TFWM[2:0]
R/W
14
0
R/W
13
0
Initial
Value
000
10000
12
R
1
R/W
R/W
R
11
R
0
TFUA[4:0]
10
R
0
Description
Transmit FIFO Watermark
000: Issue a transfer request when 16 stages of the
001: Setting prohibited
010: Setting prohibited
011: Setting prohibited
100: Issue a transfer request when 12 or more stages
101: Issue a transfer request when 8 or more stages of
110: Issue a transfer request when 4 or more stages of
111: Issue a transfer request when 1 or more stages of
•
•
Transmit FIFO Usable Area
These bits indicate the number of words that can be
transferred by the CPU or DMAC as B'00000 (full) to
B'10000 (empty).
R
9
0
A transfer request to the transmit FIFO is issued by
the TDREQE bit in SISTR.
The transmit FIFO is always used as 16 stages of
the FIFO regardless of these bit settings.
transmit FIFO are empty.
of the transmit FIFO are empty.
the transmit FIFO are empty.
the transmit FIFO are empty.
transmit FIFO are empty. Setting prohibited when
using the DMA transfer.
R
8
0
R/W
7
0
RFWM[2:0]
R/W
6
0
R/W
5
0
R
4
0
R
3
0
RFUA[4:0]
R
2
0
R
1
0
R
0
0
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