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參數資料
型號: MC68HC916X1
廠商: Motorola, Inc.
英文描述: 16-Bit Modular Microcontroller(16位模塊化微控制器)
中文描述: 16位微控制器模塊(16位模塊化微控制器)
文件頁數: 115/172頁
文件大?。?/td> 1035K
代理商: MC68HC916X1
MC68HC916X1
MC68HC916X1TS/D
MOTOROLA
115
SCCR0 contains a baud rate selection parameter. Baud rate must be set before the SCI is enabled.
The CPU can read and write this register at any time.
Bits [15:13] — Not Implemented
SCBR[12:0] — Baud Rate
SCI baud rate is programmed by writing a 13-bit value to BR. The baud rate is derived from the MCU
system clock by a modulus counter.
The SCI receiver operates asynchronously. An internal clock is necessary to synchronize with an in-
coming data stream. The SCI baud rate generator produces a receiver sampling clock with a frequency
16 times that of the expected baud rate of the incoming data. The SCI determines the position of bit
boundaries from transitions within the received waveform, and adjusts sampling points to the proper po-
sitions within the bit period. Receiver sampling rate is always 16 times the frequency of the SCI baud
rate, which is calculated as follows:
or
where SCBR[12:0] is in the range {1, 2, 3, …, 8191}
Writing a value of zero to SCBR[12:0] disables the baud rate generator.
Table 61
lists the SCBR[12:0] settings for standard and maximum baud rates using a 16.78 MHz sys-
tem clock.
SCCR0
— SCI Control Register 0
$YFFC08
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
SCBR[12:0]
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Table 61 SCI Baud Rates
Nominal
Baud Rate
64
110
300
600
1200
2400
4800
9600
19200
38400
76800
Maximum Rate
Actual Rate with
16.78 MHz Clock
64.0
110.0
300.0
600.1
1200.1
2400.3
4800.5
9601.1
18802.1
37604.2
75208.3
451250.0
SCBR[12:0] Value
$1B8B
$1006
$05E0
$02F0
$0178
$00BC
$005E
$002F
$0018
$000C
$0006
$0001
SCI Baud Rate
System Clock
32
SCBR[12:0]
×
--------------------------------------------
=
SCBR[12:0]
System Clock
SCI Baud Rate Desired
32
×
--------------------------------------------------------------------------
=
相關PDF資料
PDF描述
MC68HC9D60 Advance Information - Rev 4.0
MC68HC12D60 Advance Information - Rev 4.0
MC68HCL05C8A 8-Bit Microcontroller Units (MCU).(8位微控制器)
MC68HSC05C8A 8-Bit Microcontroller Units (MCU).(8位微控制器)
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