mc68hc908qb4 Freescale Semiconductor, Inc, mc68hc908qb4 Datasheet - Page 111

• Manufacturer Part Number: mc68hc908qb4
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

13.3 Functional Description
Figure 13-2
serial communication between the MCU and remote devices, including other MCUs. The transmitter and
receiver of the ESCI operate independently, although they use the same baud rate generator.
Freescale Semiconductor
BUSCLKX4
SL = 1 -> SCI_CLK = BUSCLK
SL = 0 -> SCI_CLK = BUSCLKX4
CLOCK
BUS
shows the structure of the ESCI module. The ESCI allows full-duplex, asynchronous, NRZ
PRESCALER
ENHANCED
RxD
SL
SCTIE
SCRIE
RWU
LINR
TCIE
SBK
ILIE
RE
TE
SHIFT REGISTER
ESCI DATA
REGISTER
RECEIVE
÷ 4
CONTROL
WAKEUP
Figure 13-2. ESCI Module Block Diagram
SCTE
SCRF
IDLE
SCALER
TC
ENSCI
PRE-
MC68HC908QB8 Data Sheet, Rev. 2
GENERATOR
BAUD RATE
÷ 16
CONTROL
RECEIVE
INTERNAL BUS
LOOPS
BKF
RPF
DATA SELECTION
CONTROL
OR
NF
FE
PE
FLAG
CONTROL
WAKE
LOOPS
ILTY
PEN
PTY
ENSCI
M
TRANSMIT
CONTROL
SHIFT REGISTER
TXINV
ORIE
NEIE
PEIE
FEIE
R8
REGISTER
TRANSMIT
T8
ESCI DATA
LINT
Functional Description
BUS CLOCK
SCI_TxD
IN SCIACTL
ACLK BIT
RxD
SL
111
TxD