SCI Functional Description
12.5 SCI Functional Description
Figure 12-5 shows the structure of the SCI.
INTERNAL BUS
SCI DATA
REGISTER
SCI DATA
REGISTER
RECEIVE
SCI_RxD
TRANSMIT
SCI_TxD
SHIFT REGISTER
SHIFT REGISTER
SCTIE
TCIE
R8
T8
SCRIE
ILIE
DMARE
DMATE
TE
SCTE
RE
TC
RWU
SCRF
SBK
IDLE
OR
NF
FE
PE
ORIE
NEIE
FEIE
PEIE
LOOPS
ENSCI
LOOPS
RECEIVE
CONTROL
FLAG
CONTROL
TRANSMIT
CONTROL
WAKEUP
CONTROL
M
BKF
RPF
CKS
SL
ENSCI
WAKE
ILTY
PEN
PTY
BAUD RATE
GENERATOR
CGMXCLK
BUS CLOCK
A
X
B
SL = 0 => X = A
SL = 1 => X = B
DATA SELECTION
CONTROL
÷16
SCI_R32XCLK
SCI_R16XCLK
Figure 12-5. SCI Module Block Diagram
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
185
FREESCALE [ Freescale ]
