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MC68HC908AS32A Datasheet, PDF (171/280 Pages) Freescale Semiconductor, Inc – Microcontrollers
Functional Description
14.4.3.1 Character Length
The receiver can accommodate either 8-bit or 9-bit data. The state of the M bit in SCI control register 1
(SCC1) determines character length. When receiving 9-bit data, bit R8 in SCI control register 2 (SCC2)
is the ninth bit (bit 8). When receiving 8-bit data, bit R8 is a copy of the eighth bit (bit 7).
INTERNAL BUS
CGMXCLK
SCP1
SCP0
÷4
PRE-
BAUD
SCALER DIVIDER
SCR2
SCR1
SCR0
÷ 16
PTE1/RxD
DATA
RECOVERY
ALL 0s
BKF
RPF
SCI DATA REGISTER
11-BIT
RECEIVE SHIFT REGISTER
H876543210L
M
WAKE
ILTY
PEN
PTY
WAKEUP
LOGIC
PARITY
CHECKING
SCRF
RWU
IDLE
R8
CPU INTERRUPT
REQUEST
ERROR CPU
INTERRUPT REQUEST
IDLE
ILIE
SCRF
SCRIE
ILIE
SCRIE
OR
ORIE
OR
ORIE
NF
NF
NEIE
NEIE
FE
FE
FEIE
FEIE
PE
PE
PEIE
PEIE
Figure 14-5. SCI Receiver Block Diagram
MC68HC908AS32A Data Sheet, Rev. 2.0
Freescale Semiconductor
171