参数资料
型号: TS87C54X2-VIEB
英文描述: MICROCONTROLLER|8-BIT|8051 CPU|CMOS|QFP|44PIN|PLASTIC
中文描述: 单片机| 8位| 8051处理器|的CMOS | QFP封装| 44PIN |塑料
文件页数: 5/74页
文件大小: 689K
代理商: TS87C54X2-VIEB
Rev. C - 06 March, 2001
13
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
Table 3. CKCON Register
CKCON - Clock Control Register (8Fh)
Reset Value = XXXX XXX0b
Not bit addressable
For further details on the X2 feature, please refer to ANM072 available on the web (http://www.atmel-wm.com)
7
6
5
4
3
2
1
0
-
X2
Bit Number
Bit
Mnemonic
Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
X2
CPU and peripheral clock bit
Clear to select 12 clock periods per machine cycle (STD mode, FOSC=FXTAL/2).
Set to select 6 clock periods per machine cycle (X2 mode, FOSC=FXTAL).
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