mc68hc11c0 Freescale Semiconductor, Inc, mc68hc11c0 Datasheet - Page 66

• Manufacturer Part Number: mc68hc11c0
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

SCSR — SCI Status Register
TDRE — Transmit Data Register Empty Flag
TC — Transmit Complete Flag
RDRF — Receive Data Register Full Flag
IDLE — Idle Line Detected Flag
OR — Overrun Error Flag
NF — Noise Error Flag
FE — Framing Error
Bit 0 — Not implemented
66
MOTOROLA
RESET:
This flag is set when SCDR is empty. Clear the TDRE flag by reading SCSR and then writing to SCDR.
This flag is set when the transmitter is idle (no data, preamble, or break transmission in progress). Clear
the TC flag by reading SCSR and then writing to SCDR.
RDRF is set if a received character is ready to be read from SCDR. Clear the RDRF flag by reading
SCSR and then reading SCDR.
This flag is set if the RxD line is idle. Once cleared, IDLE is not set again until the RxD line has been
active and becomes idle again. The IDLE flag is inhibited when RWU = 1. Clear IDLE by reading SCSR
and then reading SCDR.
OR is set if a new character is received before a previously received character is read from SCDR. Clear
the OR flag by reading SCSR and then reading SCDR.
NF is set if majority sample logic detects anything other than a unanimous decision. Clear NF by reading
SCSR and then reading SCDR.
FE is set when a zero is detected where a stop bit was expected. Clear the FE flag by reading SCSR
and then reading SCDR.
Always reads zero
0 = SCDR busy
1 = SCDR empty
0 = Transmitter busy
1 = Transmitter idle
0 = SCDR empty
1 = SCDR full
0 = RxD line is active
1 = RxD line is idle
0 = No overrun
1 = Overrun detected
0 = Unanimous decision
1 = Noise detected
0 = Stop bit detected
1 = Zero detected
TDRE
Bit 7
1
TC
6
1
Freescale Semiconductor, Inc.
For More Information On This Product,
RDRF
5
0
Go to: www.freescale.com
IDLE
4
0
OR
3
0
NF
2
0
FE
1
0
Bit 0
—
$002E
0
MC68HC11C0TS/D
MC68HC11C0