MC9S12T64 Datasheet, PDF (438/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
Transmitter
INTERNAL BUS
MODULE
CLOCK
BAUD DIVIDER
÷ 16
SCI DATA REGISTERS
SBR12–SBR0
11-BIT TRANSMIT SHIFT REGISTER
M
H8 7 6 5 4 3 2 1 0 L
TX
T8
PE
PARITY
PT
GENERATION
LOOP
CONTROL
TO
RECEIVER
LOOPS
RSRC
TDRE INTERRUPT REQUEST
TC INTERRUPT REQUEST
TRANSMITTER CONTROL
TDRE
TIE
TC
TCIE
TE
SBK
BRK13
Figure 78 Transmitter Block Diagram
Transmitter
Character Length
The SCI transmitter can accommodate either 8-bit or 9-bit data
characters. The state of the M bit in SCI control register 1 (SCIxCR1)
determines the length of data characters. When transmitting 9-bit data,
bit T8 in SCI data register high (SCIxDRH) is the ninth bit (bit 8).
Character
Transmission
To transmit data, the MCU writes the data bits to the SCI data registers
(SCIxDRH/SCIxDRL), which in turn are transferred to the transmitter
MC9S12T64Revision 1.1.1
Serial Communications Interface (SCI)
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