r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1147

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

Bit
1
0
Bit Name
RFUDF
RFOVF
Initial
Value
0
0
R/W
R/W
R/W
Description
Receive FIFO Underflow
0: Indicates that no receive FIFO underflow occurs
1: Indicates that a receive FIFO underflow occurs
A receive FIFO underflow means that reading of SIRDR
has occurred when the receive FIFO is empty.
When a receive FIFO underflow occurs, the value of
data read from SIRDR is not guaranteed.
•
•
•
Receive FIFO Overflow
0: Indicates that no receive FIFO overflow occurs
1: Indicates a receive FIFO overflow occurs
A receive FIFO overflow means that writing has
occurred when the receive FIFO is full.
When a receive FIFO overflow occurs, the SIOF
indicates overflow, and receive data is lost.
•
•
•
This bit is valid when the RXE bit in SICTR is 1.
When 1 is written to this bit, the contents are
cleared. Writing 0 to this bit is invalid.
To enable the issuance of this interrupt source, set
the RFUDFE bit in SIIER is set to 1.
This bit is valid when the RXE bit in SICTR is 1.
When 1 is written to this bit, the contents are
cleared. Writing 0 to this bit is invalid.
To enable the issuance of this interrupt source, set
the RFOVFE bit in SIIER is set to 1.
Rev.1.00 Jan. 10, 2008 Page 1117 of 1658
22. Serial I/O with FIFO (SIOF)
REJ09B0261-0100