參數(shù)資料
型號: AT83C51RB2XXX-SLSIL
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: Microcontroller
中文描述: 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 10/81頁
文件大?。?/td> 1082K
代理商: AT83C51RB2XXX-SLSIL
11
AT80C51RD2/AT83C51Rx2
4113A–8051–09/02
Figure 3.
Mode Switching Waveforms
The X2 bit in the CKCON0 register (see Table 5) allows to switch from 12 clock periods
per instruction to 6 clock periods and vice versa. At reset, the speed is set according to
X2 bit of Hardware Config Byte (HCB). By default, Standard mode is activated. Setting
the X2 bit activates the X2 feature (X2 mode).
The T0X2, T1X2, T2X2, UARTX2, PCAX2 and WDX2 bits in the CKCON0 register
(Table 5) allow to switch from standard peripheral speed (12 clock periods per periph-
eral clock cycle) to fast peripheral speed (6 clock periods per peripheral clock cycle).
These bits are active only in X2 mode.
XTAL1:2
CPU Block
X2 Bit
X2 Mode
STD Mode
STD Mode
F
OSC
XTAL1
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