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參數資料
型號: MC68HC11K4VFN4
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Technical Summary 8-Bit Microcontroller
中文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQCC84
封裝: PLASTIC, LCC-84
文件頁數: 49/80頁
文件大小: 420K
代理商: MC68HC11K4VFN4
M68HC11 K Series
MC68HC11KTS/D
MOTOROLA
49
7 Serial Communications Interface
The SCI, a universal asynchronous receiver transmitter (UART) serial communications interface, is one
of two independent serial I/O subsystems in M68HC11 K-series MCUs. Rearranging registers and con-
trol bits used in previous M68HC11 family devices has enhanced the existing SCI system and added
new features, which include the following:
A 13-bit modulus prescaler that allows greater baud rate control
A new idle mode detect, independent of preceding serial data
A receiver active flag
Hardware parity for both transmitter and receiver
The enhanced baud rate generator is shown in the following diagram. Refer to
Table 7
for standard val-
ues.
Figure 9 SCI Baud Generator Circuit Diagram
13-BIT COUNTER
13-BIT COMPARE
SCBDH/L
SCI BAUD CONTROL
INTERNAL
PHASE 2 CLOCK
=
÷
2
SYNCH
÷
16
RECEIVER
BAUD RATE
CLOCK
TRANSMITTER
BAUD RATE
CLOCK
EXTAL
RESET
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