Motorola MC68HC908MR32 사용자 설명서
Advance Information
MC68HC908MR16/MC68HC908MR32 — Rev. 4.0
304
Serial Communications Interface Module (SCI)
MOTOROLA
Serial Communications Interface Module (SCI)
14.8.6 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.
and the receive and transmit shift registers. Reset has no effect on data
in the SCI data register.
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.
R7:R0. Writing to address $003D writes the data to be transmitted,
T7:T0. Reset has no effect on the SCI data register.
14.8.7 SCI Baud Rate Register
The baud rate register (SCBR) selects the baud rate for both the receiver
and the transmitter.
and the transmitter.
Address:
$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 14-13. SCI Data Register (SCDR)
Address:
$003E
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
SCP1
SCP0
0
SCR2
SCR1
SCR0
Write:
R
R
R
Reset:
0
0
0
0
0
0
0
0
R
= Reserved
Figure 14-14. SCI Baud Rate Register (SCBR)