MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 389

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

13.3.2.6
Read: Anytime; reading accesses SCI receive data register
Write: Anytime; writing accesses SCI transmit data register; writing to R8 has no effect
Freescale Semiconductor
Module Base + 0x_0007
Module Base + 0x_0006
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).
Received Bits — Received bits seven through zero for 9-bit or 8-bit data formats
Transmit Bits — Transmit bits seven through zero for 9-bit or 8-bit formats
R8
R7
T7
SCI Data Registers (SCIDRH and SCIDRL)
0
0
7
7
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.
If the value of T8 is the same as in the previous transmission, T8 does not
= Unimplemented or Reserved
R6
T8
T6
Figure 13-8. SCI Data Registers (SCIDRH and SCIDRL)
0
0
6
6
Table 13-7. SCIDRH AND SCIDRL Field Descriptions
R5
T5
0
0
0
5
5
Chapter 13 Serial Communications Interface (S12SCIV2) Block Description
MC9S12Q128
Rev 1.09
NOTE
R4
T4
0
0
0
4
4
Description
R3
T3
0
0
0
3
3
R2
T2
0
0
0
2
2
R1
T1
0
0
0
1
1
R0
T0
0
0
0
0
0
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