参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 139/157页
文件大小: 2252K
代理商: MCC68HC711D3
Serial Communications Interface (SCI)
Data Sheet
MC68HC711D3 — Rev. 2
82
Serial Communications Interface (SCI)
MOTOROLA
SCR2–SCR0 — SCI Baud Rate Select Bits
These three bits select receiver and transmitter bit rate based on output from
baud rate prescaler stage.
The prescale bits, SCP1 and SCP0, determine the highest baud rate and
the SCR2–SCR0 bits select an additional binary submultiple (
÷1, ÷2, ÷4,
through
÷128) of this highest baud rate. The result of these two dividers in series
is the 16 X receiver baud rate clock. The SCR2–SCR0 bits are not affected by
reset and can be changed at any time, although they should not be changed
when any SCI transfer is in progress.
Figure 6-8 illustrates the SCI baud rate timing chain. The prescale select bits
determine the highest baud rate. The rate select bits determine additional divide
by two stages to arrive at the receiver timing (RT) clock rate. The baud rate clock
is the result of dividing the RT clock by 16.
Table 6-2. Baud Rate Selects
SCR2–SCR0
Divide
Prescaler
By
Highest Baud Rate
(Prescaler Output from Table 6-1)
4800
9600
38.4 K
0 0 0
1
4800
9600
38.4 K
0 0 1
2
2400
4800
19.2 K
0 1 0
4
1200
2400
9600
0 1 1
8
600
1200
4800
1 0 0
16
300
600
2400
1 0 1
32
150
300
1200
1 1 0
64
150
600
1 1 1
128
300
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