參數(shù)資料
型號(hào)： MC68HC711D3CP3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 110/138頁
文件大?。?/td> 1047K
代理商： MC68HC711D3CP3
SCI Registers
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
73
SCP1 and SCP0 — SCI Baud Rate Prescaler Select Bits
These two bits select a prescale factor for the SCI baud rate generator that determines the highest
possible baud rate.
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 6-1. Baud Rate Prescale Selects
SCP1
and SCP0
Divide
Internal Clock
By
Crystal Frequency in MHz
4.0 MHz
(Baud)
8.0 MHz
(Baud)
10.0 MHz
(Baud)
12.0 MHz
(Baud)
0 0
1
62.50 K
125.0 K
156.25 K
187.5 K
0 1
3
20.83 K
41.67 K
52.08 K
62.5 K
1 0
4
15.625 K
31.25 K
38.4 K
46.88 K
1 1
13
4800
9600
12.02 K
14.42 K
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
相關(guān)PDF資料
PDF描述
MC68HC11D3CFN3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC44
MC68HC11D3CFB1 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP44
MC68L11D0CFB3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP44
MC68HC11D0CFN2R2 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC44
MC68HC11D3CP1 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP40
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