mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 327

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

10.4.5
10.4.5.1
The SCI transmitter can accommodate either 8-bit or 9-bit data characters. The state of the M bit in SCI
control register 1 (SCICR1) determines the length of data characters. When transmitting 9-bit data, bit T8
in SCI data register high (SCIDRH) is the ninth bit (bit 8).
10.4.5.2
To transmit data, the MCU writes the data bits to the SCI data registers (SCIDRH/SCIDRL), which in turn
are transferred to the transmitter shift register. The transmit shift register then shifts a frame out through
the TXD pin, after it has prefaced them with a start bit and appended them with a stop bit. The SCI data
registers (SCIDRH and SCIDRL) are the write-only buffers between the internal data bus and the transmit
shift register.
Freescale Semiconductor
TDRE IRQ
BER IRQ
TC IRQ
Clock
Bus
SBR12:SBR0
Transmitter
Transmitter Character Length
Character Transmission
Baud Divider
PE
PT
M
Generation
÷ 16
Parity
T8
MC9S12VR Family Reference Manual, Rev. 2.2
Figure 10-16. Transmitter Block Diagram
Preliminary - Subject to Change Without Notice
BERRIF
TDRE
TCIE
TCIE
TIE
TC
H
8
7
11-Bit Transmit Register
6
5
SCI Data Registers
4
Internal Bus
Transmitter Control
TE
3
2
Collision Detect
SBK
1
Transmit
0
BERRM[1:0]
L
Serial Communication Interface (S12SCIV5)
TXPOL
CONTROL
LOOP
SCTXD
SCRXD
(From Receiver)
LOOPS
RSRC
To Receiver
SCTXD
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