参数资料
型号: MC68HC11ED0CFN2
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 81/108页
文件大小: 1672K
代理商: MC68HC11ED0CFN2
Technical Summary
MC68HC11ED0 — Rev. 1.0
Serial Communications Interface (SCI)
Serial Communications Interface (SCI)
7.3 SCI Registers
This subsection describes the SCI registers.
7.3.1 Baud Rate Register
TCLR — Clear Baud Rate Counter Bit
TCLR can be set only in test modes.
1 = Clear baud rate counter chain for testing purposes
0 = Normal SCI operation
SCP[1:0] — SCI Baud Rate Prescaler Select Bits
Refer to Table 7-1 for the prescaler rates. The shaded boxes contain
the prescaler rates used in the Table 7-2.
Address:
$002B
Bit 7
6
54321
Bit 0
Read:
TCLR
SCP1
SCP0
RCKB
SCR2
SCR1
SCR0
Write:
Reset:
00
000
U
= Unimplemented
U = Unaffected
Figure 7-3. Baud Rate Register (BAUD)
Table 7-1. Prescaler Rates
SCP[1:0]
Divide
E Clock By
Crystal Frequency in MHz
4.0 MHz
(Baud)
8.0 MHz
(Baud)
12.0 MHz
(Baud)
0 0
1
62.50 k
125.0 k
187.5 k
0 1
3
20.83 k
41.67 k
62.5 k
1 0
4
15.625 k
31.25 k
46.88 k
1 1
13
4800
9600
14.4 k
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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