Справочник Пользователя для Motorola MC68HC908MR16
Serial Communications Interface Module (SCI)
Functional Description
MC68HC908MR16/MC68HC908MR32 — Rev. 4.0
Advance Information
MOTOROLA
Serial Communications Interface Module (SCI)
279
14.4 Functional Description
shows the structure of the SCI module. The SCI allows
full-duplex, asynchronous, NRZ serial communication among the MCU
and remote devices, including other MCUs. The transmitter and receiver
of the SCI operate independently, although they use the same baud rate
generator. During normal operation, the CPU monitors the status of the
SCI, writes the data to be transmitted, and processes received data.
and remote devices, including other MCUs. The transmitter and receiver
of the SCI operate independently, although they use the same baud rate
generator. During normal operation, the CPU monitors the status of the
SCI, writes the data to be transmitted, and processes received data.
Figure 14-1. SCI Module Block Diagram
SCTE
TC
SCRF
IDLE
OR
NF
FE
PE
FE
PE
SCTIE
TCIE
SCRIE
ILIE
TE
RE
RWU
SBK
R8
T8
ORIE
FEIE
PEIE
PEIE
BKF
RPF
RPF
SCI DATA
RECEIVE
SHIFT REGISTER
SCI DATA
REGISTER
TRANSMIT
SHIFT REGISTER
NEIE
M
WAKE
ILTY
FLAG
CONTROL
TRANSMIT
CONTROL
RECEIVE
CONTROL
DATA SELECTION
CONTROL
WAKEUP
PTY
PEN
REGISTER
TR
AN
SMI
TTE
R
IN
TE
RR
UP
T
CO
NT
RO
L
RE
CE
IV
ER
IN
TE
RR
UP
T
CO
NT
RO
L
ER
RO
R
IN
TE
RR
UP
T
CO
NT
RO
L
CONTROL
ENSCI
LOOPS
ENSCI
PTF4/RxD
PTF5/TxD
INTERNAL BUS
TXINV
LOOPS
÷
4
÷
16
PRE-
SCALER
BAUD RATE
GENERATOR
f
OP