mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 429

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

RWU — Receiver Wakeup
SBK — Send Break
D.7.6 SCI Status Register
SCSR — SCI Status Register
Bits[15:9] — Not implemented
TDRE — Transmit Data Register Empty
TC — Transmit Complete
RDRF — Receive Data Register Full
RAF — Receiver Active
IDLE — Idle-Line Detected
MC68HC16Y3/916Y3
USER’S MANUAL
RESET:
15
SCSR contains flags that show SCI operating conditions. These flags are cleared
either by SCI hardware or by a read/write sequence. The sequence consists of reading
SCSR, then reading or writing SCDR.
If an internal SCI signal for setting a status bit comes after reading the asserted status
bits, but before writing or reading SCDR, the newly set status bit is not cleared. SCSR
must be read again with the bit set and SCDR must be read or written before the status
bit is cleared.
A long-word read can consecutively access both SCSR and SCDR. This action clears
receive status flag bits that were set at the time of the read, but does not clear TDRE
or TC flags. Reading either byte of SCSR causes all 16 bits to be accessed, and any
status bit already set in either byte is cleared on a subsequent read or write of SCDR.
0 = Normal receiver operation (received data recognized).
1 = Wakeup mode enabled (received data ignored until receiver is awakened).
0 = Normal operation
1 = Break frame(s) transmitted after completion of the current frame.
0 = Transmit data register still contains data to be sent to the transmit serial shifter.
1 = A new character can now be written to the transmit data register.
0 = SCI transmitter is busy.
1 = SCI transmitter is idle.
0 = Receive data register is empty or contains previously read data.
1 = Receive data register contains new data.
0 = SCI receiver is idle.
1 = SCI receiver is busy.
0 = SCI receiver did not detect an idle-line condition.
1 = SCI receiver detected an idle-line condition.
NOT USED
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
9
TDRE
8
1
TC
7
1
RDRF
6
0
RAF
5
0
IDLE
4
0
OR
3
0
NF
2
0
$YFFC0C
MOTOROLA
FE
1
0
D-51
PF
0
0