HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 575

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Bit 5—Transmit Data FIFO Empty (TDFE): Indicates that data has been transferred from the
transmit FIFO data register (SCFTDR) to the transmit shift register (SCTSR), the number of data
bytes in SCFTDR has fallen to or below the transmit trigger data number set by bits TTRG1 and
TTRG0 in the FIFO control register (SCFCR), and transmit data can be written to SCFTDR.
Bit 5: TDFE
0
1
Note: * As SCFTDR is a 16-byte FIFO register, the maximum number of bytes that can be written
Bit 4—Break Detect (BRK): Indicates that a receive data break signal has been detected.
Bit 4: BRK
0
1
Note: When a break is detected, transfer to SCFRDR of the receive data (H'00) following
562
when TDFE = 0 is {16 – (transmit trigger set number)}. Data written in excess of this will be
ignored. The number of data bytes in SCFTDR is indicated by the upper 8 bits of SCFDR.
detection is halted. When the break ends and the receive signal returns to mark “1”, receive
data transfer is resumed.
Description
A number of transmit data bytes exceeding the transmit trigger set number
have been written to SCFTDR
[Clearing conditions]
The number of transmit data bytes in SCFTDR does not exceed the transmit
trigger set number
[Setting conditions]
Description
A break signal has not been received
[Clearing conditions]
A break signal has been received
[Setting condition]
When data with a framing error is received, and a framing error also occurs in
the next receive data (all space “0”)
When transmit data exceeding the transmit trigger set number is written to
SCFTDR, and 0 is written to TDFE after reading TDFE = 1
When transmit data exceeding the transmit trigger set number is written to
SCFTDR by the on-chip DMAC
In a reset or in standby mode
When the number of SCFTDR transmit data bytes falls to or below the
transmit trigger set number as the result of a transmit operation*
In a reset or in standby mode
When 0 is written to BRK after reading BRK = 1
(Initial value)
(Initial value)