MC68HC812A4 Datasheet, PDF (257/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Serial Communications Interface Module (SCI)
Register Descriptions and Reset Initialization
RAF — Receiver Active Flag
RAF is set when the receiver detects a logic 0 during the RT1 time
period of the start bit search. RAF is cleared when the receiver
detects false start bits (usually from noise or baud rate mismatch) or
when the receiver detects an idle character.
1 = Reception in progress
0 = No reception in progress
14.7.6 SCI Data Registers
SCI0: $00C6
SCI1: $00CE
Bit 7
6
5
4
3
2
1
Bit 0
Read: R8
0
0
0
0
0
0
T8
Write:
Reset:
Unaffected by reset
= Unimplemented
Figure 14-23. SCI Data Register High (SC0DRH or SC1DRH)
SCI0: $00C7
SCI1: $00CF
Bit 7
6
5
4
3
2
1
Bit 0
Read: R7
R6
R5
R4
R3
R2
R1
R0
Write: T7
T6
T5
T4
T3
T2
T1
T0
Reset:
Unaffected by reset
Figure 14-24. SCI Data Register Low (SC0DRL or SC1DRL)
Read: Anytime; reading accesses receive data register
Write: Anytime; writing accesses transmit data register; writing to R8
has no effect
Advance Information
MOTOROLA
Serial Communications Interface Module (SCI)
MC68HC812A4 — Rev. 3.0
257