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AT89C51RC2-3CSIM Datasheet(PDF) 13 Page - ATMEL Corporation

Part # AT89C51RC2-3CSIM
Description  8-bit Microcontroller with 16K/ 32K Bytes Flash
PDF  125 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51RC2-3CSIM Datasheet(HTML) 13 Page - ATMEL Corporation

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AT89C51RB2/RC2
4180B–8051–04/03
Functional Block
Diagram
Figure 3. Functional Oscillator Block Diagram
Prescaler Divider
•
A hardware RESET puts the prescaler divider in the following state:
•
CKRL = FFh: FCLK CPU = FCLK PERIPH = FOSC/2 (Standard C51 feature)
•
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 = FCLK PERIPH = FOSC/1020 (Standard Mode)
F
CLK CPU = FCLK PERIPH = FOSC/510 (X2 Mode)
•
CKRL = FFh: maximum frequency
F
CLK CPU = FCLK PERIPH = FOSC/2 (Standard Mode)
F
CLK CPU = FCLK PERIPH = FOSC (X2 Mode)
F
CLK CPU and FCLK PERIPH
In X2 Mode, for CKRL<>0xFF:
In X1 Mode, for CKRL<>0xFF then:
Xtal2
Xtal1
Osc
CLK
Idle
CPU clock
CKRL
Reload
8-bit
Prescaler-Divider
Reset
Peripheral Clock
:2
X2
0
1
F
OSC
CKCON0
CLK
PERIPH
CPU
CKRL = 0xFF?
0
1
F
CPU
F
=
CLKPERIPH
F
OSC
2
255
CKRL
–
()
×
-----------------------------------------------
=
F
CPU
F
=
CLKPERIPH
F
OSC
4
255
CKRL
–
()
×
-----------------------------------------------
=



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