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| 型号： | AT80C51RB2-3CSUM |
| 厂商： | Atmel Corp. |
| 英文描述： | 80C51 High Performance ROM 8-bit Microcontroller |
| 中文描述： | 80C51的高性能ROM的8位微控制器 |
| 文件页数： | 8/83页 |
| 文件大小： | 672K |
| 代理商： | AT80C51RB2-3CSUM |
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9
AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
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
–
(
)
×
----------------------------------------------
=
相关PDF资料 |
PDF描述 |
|---|---|
| AT80C51RB2-RLTIL | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTIM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUL | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSCM | 80C51 High Performance ROM 8-bit Microcontroller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT80C51RB2-RLTIL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTIM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSCM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
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