参数资料
型号: MC68HC11FC0CFU5
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: Technical Summary 8-Bit Microcontroller
中文描述: 8-BIT, 6 MHz, MICROCONTROLLER, PQFP64
封装: QFP-64
文件页数: 37/74页
文件大小: 513K
代理商: MC68HC11FC0CFU5
MOTOROLA
MC68HC11F1/FC0
42
MC68HC11FTS/D
9 Serial Communications Interface (SCI)
The SCI, a universal asynchronous receiver transmitter (UART) serial communications interface, is one
of two independent serial I/O subsystems in the MC68HC11F1 and MC68HC11FC0. The SCI has a
standard non-return to zero (NRZ) format (one start bit, eight or nine data bits, and one stop bit) and
several selectable baud rates. The transmitter and receiver are independent but use the same data for-
mat and bit rate.
9.1 SCI Block Diagrams
Figure 9 SCI Transmitter Block Diagram
TC
TDRE
SCSR1
SCI STATUS 1
SCCR2
SCI CONTROL 2
TRANSMITTER
CONTROL LOGIC
TCIE
TC
TIE
TDRE
SCI Rx
QUESTS
SCI INTERRUPT
REQUEST
INTERNAL
DATA BUS
PIN BUFFER
AND CONTROL
H
10 (11) - BIT Tx SHIFT REGISTER
DDD1
SCDR Tx BUFFER
TRANSFER
Tx
BUFFER
SHIFT
ENABLE
JAM
ENABLE
PREAMBLE—JAM
1s
BREAK—JAM
0s
(WRITE ONLY)
FORCE PIN
DIRECTION (OUT)
SIZE
8/9
M
SCCR1
SCI CONTROL 1
TRANSMITTER
BAUD RATE
CLOCK
TIE
TCIE
TE
SBK
(8) 76543210L
PD1
TxD
T8
R8
WAKE
RDRF
IDLE
OR
NF
FE
RIE
ILIE
RE
RWU
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