MC68HC912D60 Motorola, MC68HC912D60 Datasheet - Page 266
MC68HC912D60
Manufacturer Part Number
MC68HC912D60
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC68HC912D60.pdf
(460 pages)
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Multiple Serial Interface
15.4.1 Data Format
15.4.2 SCI Baud Rate Generation
Technical Data
266
The serial data format requires the following conditions:
The basis of the SCI baud rate generator is a 13-bit modulus counter.
This counter gives the generator the flexibility necessary to achieve a
reasonable level of independence from the CPU operating frequency
and still be able to produce standard baud rates with a minimal amount
of error. The clock source for the generator comes from the M Clock.
•
•
•
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
An idle-line in the high state before transmission or reception of a
message.
A start bit (logic zero), transmitted or received, that indicates the
start of each character.
Data that is transmitted or received least significant bit (LSB) first.
A stop bit (logic one), used to indicate the end of a frame. (A frame
consists of a start bit, a character of eight or nine data bits and a
stop bit.)
A BREAK is defined as the transmission or reception of a logic
zero for one frame or more.
This SCI supports hardware parity for transmit and receive.
Go to: www.freescale.com
SCI Baud Rate
Multiple Serial Interface
Desired
Table 15-1. Baud Rate Generation
14400
19200
38400
1200
2400
4800
9600
110
300
600
BR Divisor for
M = 4.0 MHz
2273
833
417
208
104
52
26
17
13
—
BR Divisor for
M = 8.0 MHz
MC68HC912D60A — Rev 3.0
4545
2273
833
417
208
104
52
35
26
13
MOTOROLA
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