Datasheet

Chapter 14 Serial Communications Interface (S08SCIV4)
MC9S08SG32 Data Sheet, Rev. 8
Freescale Semiconductor 209
Figure 14-3 shows the receiver portion of the SCI.
Figure 14-3. SCI Receiver Block Diagram
H 8 7 6 5 4 3 2 1 0 L
SCID – Rx BUFFER
(READ-ONLY)
INTERNAL BUS
STOP
11-BIT RECEIVE SHIFT REGISTER
START
SHIFT DIRECTION
LSB
FROM RxD PIN
RATE CLOCK
Rx INTERRUPT
REQUEST
DATA RECOVERY
DIVIDE
16 × BAUD
SINGLE-WIRE
LOOP CONTROL
WAKEUP
LOGIC
ALL 1s MSB
FROM
TRANSMITTER
ERROR INTERRUPT
REQUEST
PARITY
CHECKING
BY 16
RDRF
RIE
IDLE
ILIE
OR
ORIE
FE
FEIE
NF
NEIE
PF
LOOPS
PEIE
PT
PE
RSRC
WAKE
ILT
RWU
M
LBKDIF
LBKDIE
RXEDGIF
RXEDGIE
ACTIVE EDGE
DETECT
RXINV
LBKDE
RWUID