Datasheet

Infrared Serial Communications Interface Module (IRSCI)
MC68HC908AP Family Data Sheet, Rev. 4
190 Freescale Semiconductor
Figure 12-8. SCI Receiver Block Diagram
12.5.3.1 Character Length
The receiver can accommodate either 8-bit or 9-bit data. The state of the M bit in IRSCI control register 1
(IRSCC1) determines character length. When receiving 9-bit data, bit R8 in IRSCI control register 2
(IRSCC2) is the ninth bit (bit 8). When receiving 8-bit data, bit R8 is a copy of the eighth bit (bit 7).
ALL 1s
ALL 0s
M
WAKE
ILTY
PEN
PTY
BKF
RPF
H876543210L
11-BIT
RECEIVE SHIFT REGISTER
STOP START
DATA
RECOVERY
DMARE
SCRF
OR
ORIE
NF
NEIE
FE
FEIE
PE
PEIE
DMARE
SCRIE
SCRF
ILIE
IDLE
WAKEUP
LOGIC
PARITY
CHECKING
MSB
ERROR CPU INTERRUPT REQUEST DMA SERVICE REQUEST
CPU INTERRUPT REQUEST
SCI DATA REGISTER
R8
DMARE
ORIE
NEIE
FEIE
PEIE
SCRIE
ILIE
RWU
SCRF
IDLE
OR
NF
FE
PE
INTERNAL BUS
PRE-
SCALER
BAUD
DIVIDER
÷ 16
SCP1
SCP0
SCR2
SCR1
SCR0
SCRIE
DMARE
SCI_RxD
CGMXCLK
BUS CLOCK
A
B
SL
X
SL = 0 => X = A
SL = 1 => X = B
CKS