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)： 8/81頁
文件大?。?/td> 1082K
代理商： AT83C51RB2XXX-SLSIL
9
AT80C51RD2/AT83C51Rx2
4113A–8051–09/02
Oscillators
Overview
One oscillator is available for CPU:
OSC used for high frequency (3 MHz to 40 MHz)
In order to optimize the power consumption and the execution time needed for a specific
task, an internal prescaler feature has been implemented between the selected oscilla-
tor and the CPU.
Registers
Table 4.
Clock Reload Register
Reset Value = 1111 1111b
Not bit addressable
Prescaler Divider
A hardware RESET puts the prescaler divider in the following state:
CKRL = FFh: F
CLK CPU
= F
CLK PERIPH
= F
OSC
/2 (Standard C51 feature)
KS signal selects OSC: F
CLK OUT
= F
OSC
Any value between FFh down to 00h can be written by software into CKRL register
in order to divide frequency of the selected oscillator:
–
CKRL = 00h: minimum frequency
F
CLK CPU
= F
CLK PERIPH
= F
OSC
/1020 (Standard Mode)
F
CLK CPU
= F
CLK PERIPH
= F
OSC
/510 (X2 Mode)
–
CKRL = FFh: maximum frequency
F
CLK CPU
= F
CLK PERIPH
= F
OSC
/2 (Standard Mode)
F
CLK CPU
= F
CLK PERIPH
= F
OSC
(X2 Mode)
–
F
CLK CPU
and F
CLK PERIPH
In X2 mode:
In X1 mode:
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
Bit
Number
Bit
Mnemonic Description
7:0
CKRL
Clock Reload Register: Prescaler value
F
CPU
F
=
CLKPERIPH
F
255
2
CKRL
F
255
–
(
)
×
----------------------------------------------
=
F
CPU
F
=
CLKPERIPH
4
CKRL
–
(
)
×
-----------------------------------------------
=
相關(guān)PDF資料
PDF描述
AT83C51RB2XXX-SLSIM Microcontroller
AT83C51RC2XXX-3CSCM Microcontroller
AT83C51RC2XXX-3CSIM Microcontroller
AT83C51RC2XXX-RLTIL Microcontroller
AT83C51RC2XXX-RLTIM Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT83C51RB2XXX-SLSIM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Microcontroller
AT83C51RC2 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller
AT83C51RC2-3CSUL 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller
AT83C51RC2-3CSUM 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller
AT83C51RC2-RLTUL 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller
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