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AT89C51ID2-RDTIM Datasheet(PDF) 21 Page - ATMEL Corporation

Part # AT89C51ID2-RDTIM
Description  8-bit Flash Microcontroller
PDF  159 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ID2-RDTIM Datasheet(HTML) 21 Page - ATMEL Corporation

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AT89C51ID2
4289A–8051–09/03
–F
CLK CPU and FCLK PERIPH, for CKRL<>0xFF
In X2 Mode:
In X1 Mode:
Timer 0: Clock Inputs
Figure 3. Timer 0: Clock Inputs
Note:
The SCLKT0 bit in OSCCON register allows to select Timer 0 Subsidiary clock.
SCLKT0 = 0: Timer 0 uses the standard T0 pin as clock input (Standard mode)
SCLKT0 = 1: Timer 0 uses the special Sub Clock as clock input, this feature can be use
as periodic interrupt for time clock.
F
CPU
F
=
CLKPERIPH
F
OSCA
2
255
CKRL
–
()
×
-----------------------------------------------
=
F
CPU
F
=
CLKPERIPH
F
OSCA
4
255
CKRL
–
()
×
-----------------------------------------------
=
SCLKT0
1
0
FCLK PERIPH
:6
T0 pin
Sub Clock
C/T
1
0
OSCCON
TMOD
Gate
INT0
TR0
Timer 0
Control



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