MCCIRM Freescale Semiconductor / Motorola, MCCIRM Datasheet - Page 89

• Manufacturer Part Number: MCCIRM
• Description: MCCIRM Multi-Channel Communications Interface Reference Manual
• Manufacturer: Freescale Semiconductor / Motorola

5.8.4 SCI Data Register
Multichannel Communication Interface — Rev. 1.0
MOTOROLA
Register name and address: SCI Data Register (SCDRA), $XXXX1E
Reset:
Read:
Write:
Bit 15
0
0
= Unimplemented
14
0
0
Figure 5-13. SCI Data Registers (SCDRA and SCDRB)
13
0
0
SCI Data Register (SCDRB), $XXXX2F
The SCDR contains two data registers at the same address. The RDR
is a read-only register that contains data received by the SCI serial
interface. The data comes into the receive serial shifter and is
transferred to the RDR. The TDR is a write-only register that contains
data to be transmitted. The data is first written to the TDR, then
transferred to the transmit serial shifter, where additional format bits are
added before transmission.
R[8:0] — Receive[8:0] Bits
T[8:0] — Transmit[8:0] Bits
12
R8 is the MSB when the SCI system is configured for 11-bit frames
(M = 1). If used, R8 represents the address mark, an extra stop bit, or
the parity mark. When the SCI system is configured for 10-bit frames
(M = 0), this bit has no meaning or effect. R7 is then the MSB before
the stop bit and may represent either data, a parity bit, a second stop
bit, or an address mark. R[6:0] represent data bits.
T8 is the MSB when the SCI system is configured for 11-bit frames
(M = 1). When used, T8 represents either the address mark, an extra
stop bit, or the parity mark. When the SCI system is configured for
10-bit frames (M = 0), this bit has no meaning or effect. T7 is then the
MSB and may represent either data, a parity bit, an extra stop bit, or
an address mark. T[6:0] represent data bits.
Freescale Semiconductor, Inc.
0
0
For More Information On This Product,
11
0
0
U = Unaffected
Go to: www.freescale.com
10
0
0
SCI Submodule
9
0
0
R8/T8 R7/T7 R6/T6 R5/T5 R4/T4 R3/T3 R2/T2 R1/T1 R0/T0
U
8
U
7
U
6
U
5
U
4
U
3
Reference Manual
U
2
SCI Submodule
SCI Registers
U
1
Bit 0
U
89