参数资料
型号: TS87C51RD2-VIMR
英文描述: Microcontroller
中文描述: 微控制器
文件页数: 4/74页
文件大小: 689K
代理商: TS87C51RD2-VIMR
12
Rev. C - 06 March, 2001
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
Figure 2. Mode Switching Waveforms
The X2 bit in the CKCON register (See Table 3.) allows to switch from 12 clock cycles per instruction to 6 clock
cycles and vice versa. At reset, the standard speed is activated (STD mode). Setting this bit activates the X2 feature
(X2 mode).
CAUTION
In order to prevent any incorrect operation while operating in X2 mode, user must be aware that all peripherals
using clock frequency as time reference (UART, timers, PCA...) will have their time reference divided by two.
For example a free running timer generating an interrupt every 20 ms will then generate an interrupt every 10 ms.
UART with 4800 baud rate will have 9600 baud rate.
XTAL1:2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
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