MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 178

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Serial Communications Interface (SCI)
18.4 Functional Description
Figure 18-1
communication between 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.
178
RxD
CGMXCLK
shows the structure of the SCI module. The SCI allows full-duplex, asynchronous, NRZ serial
SCRIE
SCTIE
RWU
TCIE
SBK
ILIE
TE
RE
SHIFT REGISTER
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
REGISTER
SCI DATA
RECEIVE
÷ 4
Generic Pin Names
CONTROL
WAKEUP
Full Pin Names
SCTE
SCRF
SCALER
IDLE
TC
ENSCI
Figure 18-1. SCI Module Block Diagram
PRE-
Table 18-1. Pin Name Conventions
GENERATOR
BAUD RATE
÷ 16
CONTROL
RECEIVE
INTERNAL BUS
PTE1/SCRxD
LOOPS
RxD
BKF
RPF
DATA SELECTION
CONTROL
OR
NF
FE
PE
FLAG
CONTROL
WAKE
ILTY
PEN
LOOPS
PTY
ENSCI
M
PTE0/SCTxD
TxD
TRANSMIT
CONTROL
SHIFT REGISTER
TXINV
ORIE
NEIE
FEIE
PEIE
R8
REGISTER
TRANSMIT
T8
SCI DATA
Freescale Semiconductor
TxD