Sci Data Register (Scix_D) - NXP Semiconductors MC9S08SU16 Reference Manual

22.4.8 SCI Data Register (SCIx_D)

This register is actually two separate registers. Reads return the contents of the read-only
receive data buffer and writes go to the write-only transmit data buffer. Reads and writes
of this register are also involved in the automatic flag clearing mechanisms for the SCI
status flags.
Address: 1868h base + 7h offset = 186Fh
Bit 7
Read
R7T7
Write
Reset
0
Field
7 Read receive data buffer 7 or write transmit data buffer 7.
R7T7
6 Read receive data buffer 6 or write transmit data buffer 6.
R6T6
5 Read receive data buffer 5 or write transmit data buffer 5.
R5T5
4 Read receive data buffer 4 or write transmit data buffer 4.
R4T4
3 Read receive data buffer 3 or write transmit data buffer 3.
R3T3
2 Read receive data buffer 2 or write transmit data buffer 2.
R2T2
1 Read receive data buffer 1 or write transmit data buffer 1.
R1T1
0 Read receive data buffer 0 or write transmit data buffer 0.
R0T0
22.5 Functional description
The SCI allows full-duplex, asynchronous, NRZ serial communication among the MCU
and remote devices, including other MCUs.
NXP Semiconductors
6 5
R6T6 R5T5
0 0
SCIx_D field descriptions
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 22 Serial Communications Interface (SCI)
4 3
R4T4 R3T3
0 0
Description
2 1
R2T2 R1T1
0 0
0
R0T0
0
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