參數(shù)資料
型號(hào)： AT83C51RD2-SLSUL
廠商： International Rectifier
英文描述： High Performance 8-bit Microcontroller
中文描述： 高性能8位微控制器
文件頁數(shù)： 13/85頁
文件大?。?/td> 762K
代理商： AT83C51RD2-SLSUL
13
4188E–8051–08/06
AT/TS8xC51Rx2
Figure 5-1.
Clock Generation Diagram
Figure 5-2.
Mode Switching Waveforms
The X2 bit in the CKCON register (
Table 5-2
) allows to switch from 12 clock cycles per instruc-
tion 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).
Note:
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 ref-
erence 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.
Table 5-2.
CKCON Register
CKCON - Clock Control Register (8Fh)
XTAL1
2
CKCON reg
X2
state machine: 6 clock cycles.
CPU control
F
OSC
F
XTAL
0
1
XTAL1:2
XTAL1:2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
STD Mode
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.
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