Datasheet

Enhanced Serial Communications Interface (ESCI) Module
MC68HC908GR16A Data Sheet, Rev. 1.0
150 Freescale Semiconductor
Figure 14-6. ESCI Receiver Block Diagram
14.4.3.1 Character Length
The receiver can accommodate either 8-bit or 9-bit data. The state of the M bit in ESCI control register 1
(SCC1) determines character length. When receiving 9-bit data, bit R8 in ESCI control register 3 (SCC3)
is the ninth bit (bit 8). When receiving 8-bit data, bit R8 is a copy of the eighth bit (bit 7).
ALL ONES
ALL ZEROS
M
WAKE
ILTY
PEN
PTY
BKF
RPF
H876543210L
11-BIT
RECEIVE SHIFT REGISTER
STOP START
DATA
RECOVERY
OR
ORIE
NF
NEIE
FE
FEIE
PE
PEIE
SCRIE
SCRF
ILIE
IDLE
WAKEUP
LOGIC
PARITY
CHECKING
MSB
ESCI DATA REGISTER
R8
SCRIE
ILIE
RWU
SCRF
IDLE
INTERNAL BUS
PRE-
SCALER
BAUD
DIVIDER
÷ 4 ÷ 16
SCP1
SCP0
SCR1
SCR2
SCR0
RxD
PRE-
SCALER
PDS1
PDS2
PDS0
PSSB3
PSSB4
PSSB2
PSSB1
PSSB0
LINR
ORIE
NEIE
FEIE
PEIE
OR
NF
FE
PE
CGMXCLK
OR
BUS CLOCK
CPU INTERRUPT
REQUEST
ERROR CPU
INTERRUPT REQUEST