Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

AT89S52 Datasheet(PDF) 19 Page - ATMEL Corporation

Part # AT89S52
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  38 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89S52 Datasheet(HTML) 19 Page - ATMEL Corporation

Back Button AT89S52_08 Datasheet HTML 15Page - ATMEL Corporation AT89S52_08 Datasheet HTML 16Page - ATMEL Corporation AT89S52_08 Datasheet HTML 17Page - ATMEL Corporation AT89S52_08 Datasheet HTML 18Page - ATMEL Corporation AT89S52_08 Datasheet HTML 19Page - ATMEL Corporation AT89S52_08 Datasheet HTML 20Page - ATMEL Corporation AT89S52_08 Datasheet HTML 21Page - ATMEL Corporation AT89S52_08 Datasheet HTML 22Page - ATMEL Corporation AT89S52_08 Datasheet HTML 23Page - ATMEL Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 19 / 38 page
background image
19
1919D–MICRO–6/08
AT89S52
14. Oscillator Characteristics
XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier that can be
configured for use as an on-chip oscillator, as shown in Figure 16-1. Either a quartz crystal or
ceramic resonator may be used. To drive the device from an external clock source, XTAL2
should be left unconnected while XTAL1 is driven, as shown in Figure 16-2. There are no
requirements on the duty cycle of the external clock signal, since the input to the internal clock-
ing circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low
time specifications must be observed.
15. Idle Mode
In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active. The
mode is invoked by software. The content of the on-chip RAM and all the special functions regis-
ters remain unchanged during this mode. The idle mode can be terminated by any enabled
interrupt or by a hardware reset.
Note that when idle mode is terminated by a hardware reset, the device normally resumes pro-
gram execution from where it left off, up to two machine cycles before the internal reset
algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but
access to the port pins is not inhibited. To eliminate the possibility of an unexpected write to a
port pin when idle mode is terminated by a reset, the instruction following the one that invokes
idle mode should not write to a port pin or to external memory.
16. Power-down Mode
In the Power-down mode, the oscillator is stopped, and the instruction that invokes Power-down
is the last instruction executed. The on-chip RAM and Special Function Registers retain their
values until the Power-down mode is terminated. Exit from Power-down mode can be initiated
either by a hardware reset or by an enabled external interrupt. Reset redefines the SFRs but
does not change the on-chip RAM. The reset should not be activated before V
CC is restored to
its normal operating level and must be held active long enough to allow the oscillator to restart
and stabilize.
Figure 16-1. Oscillator Connections
Note:
1.
C1, C2 = 30 pF
± 10 pF for Crystals
= 40 pF
± 10 pF for Ceramic Resonators
C2
XTAL2
GND
XTAL1
C1


Similar Part No. - AT89S52_08

ManufacturerPart #DatasheetDescription
logo
ATMEL Corporation
AT89S52 ATMEL-AT89S52_05 Datasheet
478Kb / 39P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
More results

Similar Description - AT89S52_08

ManufacturerPart #DatasheetDescription
logo
ATMEL Corporation
ATMEGA48V ATMEL-ATMEGA48V_06 Datasheet
3Mb / 374P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
ATMEGA88 ATMEL-ATMEGA88_1 Datasheet
369Kb / 10P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
AT89LP51 ATMEL-AT89LP51 Datasheet
4Mb / 113P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
ATMEGA8515 ATMEL-ATMEGA8515_10 Datasheet
1Mb / 257P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
ATMEGA88 ATMEL-ATMEGA88 Datasheet
210Kb / 20P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
ATTINY25B ATMEL-ATTINY25B Datasheet
254Kb / 7P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
AT90PWM3 ATMEL-AT90PWM3 Datasheet
3Mb / 365P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
AT90PWM1 ATMEL-AT90PWM1 Datasheet
399Kb / 20P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
AT89S52 ATMEL-AT89S52_05 Datasheet
478Kb / 39P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
AT90S8515 ATMEL-AT90S8515_01 Datasheet
2Mb / 112P
   8-bit Microcontroller with 8K Bytes In-System Programmable Flash
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com