M68HC16 Z SERIES
REGISTER SUMMARY
USER’S MANUAL
D-63
RDRF — Receive Data Register Full
0 = Receive data register is empty or contains previously read data.
1 = Receive data register contains new data.
RAF — Receiver Active
0 = SCI receiver is idle.
1 = SCI receiver is busy.
IDLE — Idle-Line Detected
0 = SCI receiver did not detect an idle-line condition.
1 = SCI receiver detected an idle-line condition.
OR — Overrun Error
0 = Receive data register is empty and can accept data from the receive serial
shifter.
1 = Receive data register is full and cannot accept data from the receive serial
shifter. Any data in the shifter is lost and RDRF remains set.
NF — Noise Error
0 = No noise detected in the received data.
1 = Noise detected in the received data.
FE — Framing Error
0 = No framing error detected in the received data.
1 = Framing error or break detected in the received data.
PF — Parity Error
0 = No parity error detected in the received data.
1 = Parity error detected in the received data.
D.7.12 SCI Data Register
SCDR consists of two data registers located at the same address. The receive data
register (RDR) is a read-only register that contains data received by the SCI serial in-
terface. Data comes into the receive serial shifter and is transferred to RDR. The trans-
mit data register (TDR) is a write-only register that contains data to be transmitted.
Data is first written to TDR, then transferred to the transmit serial shifter, where addi-
tional format bits are added before transmission. R[7:0]/T[7:0] contain either the first
eight data bits received when SCDR is read, or the first eight data bits to be transmitted
when SCDR is written. R8/T8 are used when the SCI is configured for nine-bit opera-
tion. When the SCI is configured for 8-bit operation, R8/T8 have no meaning or effect.
SCDRA — SCIA Data Register
$YFFC1E
SCDRB — SCIB Data Register
$YFFC2E
15
9
8
7
6
5
4
3
2
1
0
NOT USED
R8/T8
R7/T7
R6/T6
R5/T5
R4/T4
R3/T3
R2/T2
R1/T1
R0/T0
RESET:
U
U
U
U
U
U
U
U
U
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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