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參數(shù)資料
| 型號： | MC68HC11EA9VFN3 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁數(shù)： | 42/58頁 |
| 文件大?。?/td> | 583K |
| 代理商： | MC68HC11EA9VFN3 |
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MC68HC11EA9
MOTOROLA
MC68HC11EA9TS/D
47
8 Serial Communications Interface
The SCI, a universal asynchronous receiver transmitter (UART) serial communications interface, is an
independent serial I/O subsystem in MC68HC(7)11EA9 MCUs. The registers and control bits used in
previous M68HC11 SCI systems have been rearranged and new features added. New or enhanced fea-
tures 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 the table of SCI baud
rate control values for standard values.
Figure 11 SCI Baud Generator Circuit Diagram
13-BIT COUNTER
13-BIT COMPARE
SCBDH/L SCI BAUD CONTROL
INTERNAL
PHASE 2 CLOCK
(PH2)
=÷ 2
SYNCHRONIZE
WITH PH2
÷ 16
RECEIVER
BAUD RATE
CLOCK
TRANSMITTER
BAUD RATE
CLOCK
SCI BAUD CLOCK
EXTAL ÷ 2, IF MCS = 0
4XCLK ÷ 2, IF MCS = 1
RESET
EA9 BAUD GEN BLOCK
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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