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Chapter 15 Serial Communications Interface (S08SCIV4)
MCF51QE128 MCU Series Reference Manual, Rev. 3
Freescale Semiconductor 293
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Figure 15-2. SCI Module Quick Start
SBR12 SBR11 SBR10 SBR9 SBR8
SBR4 SBR3 SBR2 SBR1 SBR0SBR7 SBR6 SBR5SCIxBDL
SCIxBDH
Baud rate = BUSCLK / (16 x SBR12:SBR0)
M WAKE ILT PE PT
SCIxC1
LOOPS SCISWAI RSRC
Module configuration
ILIE TE RE RWU SBK
SCIxC2
TIE TCIE RIE
Local interrupt enables Tx and Rx enable
Rx wakeup and send break
IDLE OR NF FE PF
SCIxS1
TDRE TC RDRF
Interrupt flags Rx error flags
BRK13 RAF
SCIxS2
Configure LIN support options and monitor receiver activity
FEIE PEIE
SCIxS3
9th data bits
TXDIRR8 T8 ORIE NEIE
SCIxD
Read: Rx data; write: Tx data
R5/T5R7/T7 R6/T6
Rx/Tx pin
direction in
Local interrupt enables
R4/T4 R3/T3 R2/T2 R1/T1 R0/T0
TXINV
Tx data path
polarity
single-wire
mode
Module Initialization:
Write: SCIxBDH:SCIxBDL to set baud rate
Write: SCIxC1 to configure 1-wire/2-wire, 9/8-bit data, wakeup, and parity, if used.
Write; SCIxC2 to configure interrupts, enable Rx and Tx, RWU
Enable Rx wakeup, SBK sends break character
Write: SCIxC3 to enable Rx error interrupt sources. Also controls pin direction in
1-wire modes. R8 and T8 only used in 9-bit data modes.
Module Use:
Wait for TDRE, then write data to SCIxD
Wait for RDRF, then read data from SCIxD
A small number of applications will use RWU to manage automatic receiver wakeup, SBK to send break characters, and
R8 and T8 for 9-bit data.
LBKDIE RXEDGIE
LBKDIF RXEDGIF RXINV RWUID LBKDE