參數(shù)資料
型號(hào)： T89C51RD2-SLSCL
廠商： ATMEL CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述： 8-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 11/104頁(yè)
文件大?。?/td> 798K
代理商： T89C51RD2-SLSCL
11
T89C51RD2
4243G
–
8051
–
05/03
Figure 2.
Mode Switching Waveforms
The X2 bit in the CKCON register (Table 4) allows to switch from 12 clock periods per
instruction to 6 clock periods and vice versa. At reset, the standard speed is activated
(STD mode). Setting this bit activates the X2 feature (X2 mode).
The T0X2, T1X2, T2X2, SiX2, PcaX2 and WdX2 bits in the CKCON register (Table 4)
allow to switch from standard peripheral speed (12 clock periods per peripheral clock
cycle) to fast peripheral speed (6 clock periods per peripheral clock cycle). These bits
are active only in X2 mode.
More information about the X2 mode can be found in the application note ANM072 "How
to take advantage of the X2 features in TS80C51 microcontroller".
Table 4.
CKCON Register
CKCON - Clock Control Register (8Fh)
XTAL1:2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
STD Mode
7
6
5
4
3
2
1
0
-
WdX2
PcaX2
SiX2
T2X2
T1X2
T0X2
X2
Bit
Number
Bit
Mnemonic Description
7
-
Reserved
6
WdX2
Watchdog clock
(This control bit is validated when the CPU clock X2 is set; when
X2 is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
5
PcaX2
Programmable Counter Array clock
(This control bit is validated when the CPU
clock X2 is set; when X2 is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
4
SiX2
Enhanced UART clock (Mode 0 and 2)
(This control bit is validated when the
CPU clock X2 is set; when X2 is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
3
T2X2
Timer2 clock
(This control bit is validated when the CPU clock X2 is set; when X2
is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T89C51RD2-SLSC-L 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
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T89C51RD2-SLSIL 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SLSI-L 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
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