
Serial Communications Interface (SCI)
SCI Registers
MC68HC11E Family — Rev. 4
Technical Data
MOTOROLA
Serial Communications Interface (SCI)
153
7.8.2 Serial Communications Control Register 1
The SCCR1 register provides the control bits that determine word length
and select the method used for the wakeup feature.
R8 — Receive Data Bit 8
If M bit is set, R8 stores the ninth bit in the receive data character.
T8 — Transmit Data Bit 8
If M bit is set, T8 stores the ninth bit in the transmit data character.
Bit 5 — Unimplemented
Always reads 0
M — Mode Bit (select character format)
0 = Start bit, 8 data bits, 1 stop bit
1 = Start bit, 9 data bits, 1 stop bit
WAKE — Wakeup by Address Mark/Idle Bit
0 = Wakeup by IDLE line recognition
1 = Wakeup by address mark (most significant data bit set)
Bits [2:0] — Unimplemented
Always read 0
Address:
$102C
Bit 7
6
54321
Bit 0
Read:
R8
T8
MWAKE
Write:
Reset:
I
000000
I = Indeterminate after reset
= Unimplemented
Figure 7-4. Serial Communications Control Register 1 (SCCR1)