mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 492

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 11 Serial Communication Interface (S12SCIV5)
11.3.2.9
Read: Anytime; reading accesses SCI receive data register
Write: Anytime; writing accesses SCI transmit data register; writing to R8 has no effect
492
SCIDRH
SCIDRH
SCIDRL
Reset
Reset
R[7:0]
T[7:0]
Field
7:0
R8
T8
7
6
W
W
R
R
Received Bit 8 — R8 is the ninth data bit received when the SCI is configured for 9-bit data format (M = 1).
Transmit Bit 8 — T8 is the ninth data bit transmitted when the SCI is configured for 9-bit data format (M = 1).
R7:R0 — Received bits seven through zero for 9-bit or 8-bit data formats
T7:T0 — Transmit bits seven through zero for 9-bit or 8-bit formats
R8
R7
T7
SCI Data Registers (SCIDRH, SCIDRL)
0
0
7
7
If the value of T8 is the same as in the previous transmission, T8 does not
have to be rewritten.The same value is transmitted until T8 is rewritten
In 8-bit data format, only SCI data register low (SCIDRL) needs to be
accessed.
When transmitting in 9-bit data format and using 8-bit write instructions,
write first to SCI data register high (SCIDRH), then SCIDRL.
= Unimplemented or Reserved
R6
T8
T6
0
0
6
6
Table 11-12. SCIDRH and SCIDRL Field Descriptions
Figure 11-12. SCI Data Registers (SCIDRH)
Figure 11-13. SCI Data Registers (SCIDRL)
MC9S12XDP512 Data Sheet, Rev. 2.17
R5
T5
0
0
0
5
5
NOTE
R4
T4
0
0
0
4
4
Description
R3
T3
0
0
0
3
3
R2
T2
0
0
0
2
2
Freescale Semiconductor
R1
T1
0
0
0
1
1
R0
T0
0
0
0
0
0