MC68HC908MR8 Datasheet, PDF (276/372 Pages) Motorola, Inc – Microcontrollers

Serial Communications Interface (SCI)
13.9.6 SCI Data Register
The SCI data register (SCDR) is the buffer between the internal data bus
and the receive and transmit shift registers. Reset has no effect on data
in the SCI data register.
Ad-
dress:
$003D
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 13-13. SCI Data Register (SCDR)
R7/T7:R0/T0 — Receive/Transmit Data Bits
Reading address $003D accesses the read-only received data bits,
R7:R0. Writing to address $003D writes the data to be transmitted,
T7:T0. Reset has no effect on the SCI data register.
13.9.7 SCI Baud Rate Register
The SCI baud rate register (SCBR) selects the baud rate for both the
receiver and the transmitter.
Ad-
dress:
$003E
Bit 7
6
5
4
3
2
1
Read: 0
Write: R
0
0
SCP1 SCP0
SCR2 SCR1
R
R
Reset: 0
0
0
0
0
0
0
R = Reserved
Figure 13-14. SCI Baud Rate Register (SCBR)
Bit 0
SCR0
0
Technical Data
276
Serial Communications Interface (SCI)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor