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| 型號： | QSMRM |
| 英文描述： | QSMRM QSM Queued Serial Module Reference Manual |
| 中文描述： | QSMRM QSM排隊串行模塊參考手冊 |
| 文件頁數(shù)： | 57/112頁 |
| 文件大小： | 1496K |
| 代理商： | QSMRM |
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QSM
REFERENCE MANUAL
SCI SUBMODULE
MOTOROLA
5-1
SECTION 5
SCI SUBMODULE
The SCI submodule is used to communicate with external devices and other MCUs via
an asynchronous serial bus. The SCI is fully compatible with the SCI systems found
on other Motorola MCUs, such as the M68HC11 and M68HC05 Families. It has all of
the capabilities of previous SCI systems as well as several significant new features.
The following paragraphs describe the features, pins, programmer's model (memory
map), registers, and the transmit and receive operations of the SCI.
5.1 Features
Standard SCI features are listed below, followed by a list of additional features offered.
Standard SCI Two-Wire System Features:
Standard Nonreturn-to-Zero (NRZ) Mark/Space Format
Advanced Error Detection Mechanism (detects noise duration up to 1/16 of a bit-
time)
Full-Duplex Operation
Software Selectable Word Length (8- or 9-bit words)
Separate Transmitter and Receiver Enable Bits
May be Interrupt Driven
Four Separate Interrupt Enable Bits
Standard SCI Receiver Features:
Receiver Wakeup Function (idle or address mark bit)
Idle-Line Detect
Framing Error Detect
Noise Detect
Overrun Detect
Receive Data Register Full Flag
Standard SCI Transmitter Features:
Transmit Data Register Empty Flag
Transmit Complete Flag
Send Break
QSM-Enhanced SCI Two-Wire System Features:
13-Bit Programmable Baud-Rate Modulus Counter
— A baud rate modulus counter has been added to provide the user with more
flexibility in choosing the crystal frequency for the system clock. The modulus
counter allows the SCI baud rate generator to produce standard transmission
frequencies for a wide range of system clocks. The user is no longer con-
strained to select crystal frequencies based on the desired serial baud rate.
This counter provides baud rates from 64 baud to 524 kbaud with a 16.78-MHz
system clock.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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