XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 213

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

14.2.3.6 SCI Data Register
M68HC12B Family — Rev. 8.0
MOTOROLA
Read: Anytime
Write: Varies on a bit by bit basis
R8 — Receive Bit 8
T8 — Transmit Bit 8
R7T7–R0T0 — Receive/Transmit Data Bits 7 to 0
Address:
Address:
Write has no meaning or effect.
This bit is the ninth serial data bit received when the SCI system is configured
for 9-data-bit operation.
Write anytime.
This bit is the ninth serial data bit transmitted when the SCI system is configured
for 9-data-bit operation. When using 9-bit data format, this bit does not have to
be written for each data word. The same value is transmitted as the ninth bit until
this bit is rewritten.
Reads access the eight bits of the read-only SCI receive data register (RDR).
Writes access the eight bits of the write-only SCI transmit data register (TDR).
SC0DRL and SC0DRH form the 9-bit data word for the SCI. If the SCI is being
used with a 7- or 8-bit data word, only SC0DRL needs to be accessed. If a 9-bit
format is used, the upper register should be written first to ensure that it is
transferred to the transmitter shift register with the lower register.
Reset:
Reset:
Read:
Read:
Write:
Write:
$00C6
$00C7
R7T7
Bit 7
Bit 7
R8
U
Figure 14-10. SCI Data Register Low (SC0DRL)
Figure 14-9. SCI Data Register High (SC0DRH)
= Unimplemented
R6T6
Serial Interface
T8
U
6
6
R5T5
5
0
0
5
U = Unaffected
Unaffected by reset
R4T4
4
0
0
4
Serial Communication Interface (SCI)
R3T3
3
0
0
3
R2T2
2
0
0
2
R1T1
Serial Interface
1
0
0
1
Data Sheet
R0T0
Bit 0
Bit 0
0
0
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