MC908AP32CFBE Datasheet, PDF (185/324 Pages) Freescale Semiconductor, Inc – The following revision history table summarizes changes contained in this document. For your convenience, the page number designators have been linked to the appropriate location.

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