MC68HC908GR16A Datasheet, PDF (150/270 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Enhanced Serial Communications Interface (ESCI) Module
INTERNAL BUS
CGMXCLK
OR
BUS CLOCK
LINR
SCP1
SCP0
÷4
PDS2
PDS1
PDS0
PSSB4
PSSB3
PSSB2
PSSB1
PSSB0
PRE- BAUD
SCALER DIVIDER
SCR2
SCR1
SCR0
÷ 16
RxD
DATA
RECOVERY
ALL ZEROS
BKF
RPF
M
WAKE
ILTY
PEN
PTY
WAKEUP
LOGIC
PARITY
CHECKING
ESCI DATA REGISTER
11-BIT
RECEIVE SHIFT REGISTER
H876543210L
SCRF
RWU
IDLE
R8
CPU INTERRUPT
REQUEST
IDLE
ILIE
SCRF
SCRIE
ILIE
SCRIE
ERROR CPU
INTERRUPT REQUEST
OR
ORIE
OR
ORIE
NF
NF
NEIE
NEIE
FE
FE
FEIE
FEIE
PE
PE
PEIE
PEIE
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).
MC68HC908GR16A Data Sheet, Rev. 1.0
150
Freescale Semiconductor