Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

SST89E564-40-I-PI Datasheet(PDF) 39 Page - Silicon Storage Technology, Inc

No. de pieza SST89E564-40-I-PI
Descripción Electrónicos  FlashFlex51 MCU
Download  58 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  SST [Silicon Storage Technology, Inc]
Página de inicio  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST89E564-40-I-PI Datasheet(HTML) 39 Page - Silicon Storage Technology, Inc

Back Button SST89E564-40-I-PI Datasheet HTML 35Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 36Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 37Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 38Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 39Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 40Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 41Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 42Page - Silicon Storage Technology, Inc SST89E564-40-I-PI Datasheet HTML 43Page - Silicon Storage Technology, Inc Next Button
Zoom Inzoom in Zoom Outzoom out
 39 / 58 page
background image
Preliminary Specifications
FlashFlex51 MCU
SST89E564 / SST89V564 / SST89E554 / SST89V554
39
©2001 Silicon Storage Technology, Inc.
S71181-03-000
9/01
384
7.0 WATCHDOG TIMER
The device offers a programmable Watchdog Timer (WDT)
for fail safe protection against software deadlock and auto-
matic recovery.
To protect the system against software deadlock, the user
software must refresh the WDT within a user-defined time
period. If the software fails to do this periodical refresh, an
internal hardware reset will be initiated if enabled (WDRE=
1). The software can be designed such that the WDT times
out if the program does not work properly.
The WDT in the device uses the system clock (XTAL1) as
its time base. So strictly speaking, it is a watchdog counter
rather than a watchdog timer. The WDT register will incre-
ment every 344064 crystal clocks. The upper 8-bits of the
time base register (WDTD) are used as the reload register
of the WDT.
The WDTS flag bit is set by WDT overflow and is not
changed by WDT reset. User software can clear WDTS by
writing “1” to it.
Figure 7-1 provides a block diagram of the WDT. Two SFRs
(WDTC and WDTD) control watchdog timer operation.
During idle mode, WDT operation is temporarily sus-
pended, and resumes upon an interrupt exit from idle.
The time-out period of the WDT is calculated as follows:
Period = (255 - WDT) * 344064 * 1/fOSC
where WDT is the value loaded into the WDT register and
fOSC is the oscillator frequency.
FIGURE
7-1: BLOCK DIAGRAM OF PROGRAMMABLE WATCHDOG TIMER
384 ILL F10.2
WDT Upper Byte
WDT Reset
Internal Reset
344064
clks
Counter
CLK (XTAL1)
Ext. RST
WDTC
WDTD


Número de pieza similar - SST89E564-40-I-PI

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Silicon Storage Technol...
SST89E564RD SST-SST89E564RD Datasheet
680Kb / 62P
   FlashFlex51 MCU
SST89E564RD SST-SST89E564RD Datasheet
1Mb / 86P
   FlashFlex51 MCU
SST89E564RD-25-C-NI SST-SST89E564RD-25-C-NI Datasheet
680Kb / 62P
   FlashFlex51 MCU
SST89E564RD-25-C-NJ SST-SST89E564RD-25-C-NJ Datasheet
680Kb / 62P
   FlashFlex51 MCU
SST89E564RD-25-C-PI SST-SST89E564RD-25-C-PI Datasheet
680Kb / 62P
   FlashFlex51 MCU
More results

Descripción similar - SST89E564-40-I-PI

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Silicon Storage Technol...
SST89E564RD SST-SST89E564RD Datasheet
680Kb / 62P
   FlashFlex51 MCU
SST89C59 SST-SST89C59 Datasheet
3Mb / 45P
   FlashFlex51 MCU
SST89E58RD2 SST-SST89E58RD2 Datasheet
984Kb / 91P
   FlashFlex51 MCU
SST89E564RD SST-SST89E564RD_03 Datasheet
1Mb / 86P
   FlashFlex51 MCU
SST89C54 SST-SST89C54 Datasheet
413Kb / 50P
   FlashFlex51 MCU
SST89E52RD2 SST-SST89E52RD2_06 Datasheet
937Kb / 81P
   FlashFlex51 MCU
SST89E52RD2-RD SST-SST89E52RD2-RD Datasheet
937Kb / 81P
   FlashFlex51 MCU
logo
Renesas Technology Corp
R8C-2C RENESAS-R8C-2C Datasheet
481Kb / 60P
   MCU
R8C-32A RENESAS-R8C-32A Datasheet
455Kb / 55P
   MCU
R8C-22 RENESAS-R8C-22 Datasheet
447Kb / 52P
   MCU
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 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   Lista de Fabricantes
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