r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1142

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

22. Serial I/O with FIFO (SIOF)
22.3.7
SISTR is a 16-bit readable/writable register that indicates the SIOF state. Each bit in this register
becomes an SIOF interrupt source when the corresponding bit in SIIER is set to 1.
Rev.1.00 Jan. 10, 2008 Page 1112 of 1658
REJ09B0261-0100
Initial value:
Bit
15
14
13
R/W:
BIt:
Status Register (SISTR)
Bit Name
⎯
TCRDY
TFEMP
15
—
R
0
TCRDY
14
R
0
TFEMP
13
R
0
Initial
Value
0
0
0
TDREQ
12
R
0
R/W
R
R
R
11
—
R
0
RCRDY
10
R
0
Description
Reserved
This bit is always read as 0. The write value should
always be 0.
Transmit Control Data Ready
0: Indicates that writing to SITCR is disabled
1: Indicates that writing to SITCR is enabled
•
•
•
•
Transmit FIFO Empty
0: Indicates that transmit FIFO is not empty
1: Indicates that transmit FIFO is empty
•
•
•
RFFUL
R
9
0
If SITCR is written to when this bit is cleared to 0,
SITCR is overwritten to and the previous contents of
SITCR are not output from the SIOF_TXD pin.
This bit is valid when the TXE bit in SITCR is set to
1.
This bit indicates the SIOF state. If SITCR is written
to, this bit is automatically cleared to 0.
To enable the issuance of this interrupt source, set
the TCRDYE bit in SIIER to 1.
This bit is valid when the TXE bit in SICTR is 1.
This bit indicates the SIOF state. If SITDR is written
to, this bit is automatically cleared to 0.
To enable the issuance of this interrupt source, set
the TFEMPE bit in SIIER to 1.
RDREQ
R
8
0
—
R
7
0
—
R
6
0
SAERR
R/W
5
0
FSERR
R/W
4
0
TFOVF
R/W
3
0
TFUDF
R/W
2
0
RFUDF
R/W
1
0
RFOVF
R/W
0
0