參數(shù)資料
型號： MC68HC705CJ4FB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 62/114頁
文件大?。?/td> 4047K
代理商： MC68HC705CJ4FB
GENERAL RELEASE SPECIFICATION
SERIAL COMMUNICATIONS INTERFACE
MC68HC(7)05CJ4
8-14
Rev. 2.1
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3
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7
8
9
10
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16
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19
20
8.4 SCI Register Descriptions
The following subsections provide a description of the SCI registers.
8.4.1 SCI Baud Rate Control Register
The value in this register determines the baud rate of the SCI. SCP1:0 set the
prescaler and SCR2:0 set the final divider chain.The desired baud rate is
determined by:
baud = bus clock divided by 16 divided by (SCP1:SCP0) divided by (SCR2:SCR0).
Read: anytime
Write: anytime
SCP1:SCP0 — SCI Prescaler
These bits control the prescaler as shown in Table 8-1.
Bit 7
654321
Bit 0
$000D
BAUD
Read:
00
SCP1
SCP0
0
SCR2
SCR1
SCR0
Write:
Reset:
00000
U
= Unimplemented
U = Unaffected
Figure 8-8. SCI Baud Rate Control Register
Table 8-1. SCP1:SCP0 Select
SCP Bit
E*/16
Divided
by
Crystal Frequency (fosc) MHz
1
0
4.194304
4.0
2.4576
2.0
1.8432
0
1
131.072 kHz
125.000 kHz
76.80 kHz
62.50 kHz
57.60 kHz
0
1
3
43.691 kHz
41.666 kHz
25.60 kHz
20.833 kHz
19.20 kHz
1
0
4
32.768 kHz
31.250 kHz
19.20 kHz
15.625 kHz
14.40 kHz
1
13
10.082 kHz
9600 kHz
5.907 kHz
4800 kHz
4430 Hz
* E is the Internal Bus Clock (OSC/2)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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