Toshiba AR-B1376, AR-B1375 Watchdog Timer Setting, Led, Time Factor Time-Out Period Seconds

Page 39

AR-B1375/AR-B1376 User s Guide

5.4 WATCHDOG TIMER

This section describes how to use the Watchdog Timer, disabled, enabled, and trigger.

The AR-B1375/AR-B1376 is equipped with a programmable time-out period watchdog timer. User can use the program to enable the watchdog timer. Once you have enabled the watchdog timer, the program should trigger it every time before it times out. If your program fails to trigger or disable this timer before it times out because of system hang-up, it will generate a reset signal to reset the system. The time-out period can be programmed to be 3 to 42 seconds.

Enable (D7)

Time Base

Time Factor (D0-D2)

 

Watchdog

Register

Counter

Write and Triggerand

Compartor

Watchdog

RESET

LED

 

Figure 5-1 Watchdog Block Diagram

5.4.1 Watchdog Timer Setting

The watchdog timer is a circuit that may be used from your program software to detect crashes or hang-ups. Whenever the watchdog timer is enabled, the LED will blink to indicate that the timer is counting. The watchdog timer is automatically disabled after reset.

Once you have enabled the watchdog timer, your program must trigger the watchdog timer every time before it times-out. After you trigger the watchdog timer, it will be set to zero and start to count again. If your program fails to trigger the watchdog timer before time-out, it will generate a reset pulse to reset the system or trigger the IRQ15 signal to tell your program that the watchdog is times out.

The factor of the watchdog timer time-out constant is approximately 6 seconds. The period for the watchdog timer time-out period is between 1 to 7 timer factors.

If you want to reset your system when watchdog times out, the following table listed the relation of timer factors between time-out periods.

Time Factor

Time-Out Period (Seconds)

80H

3

81H

6

82H

12

83H

18

84H

24

85H

30

86H

36

87H

42

Table 5-1 Time-Out Setting

If you want to generate IRQ15 signal to warn your program when watchdog times out, the following table listed the relation of timer factors between time-out period. And if you use the IRQ15 signal to warn your program when watchdog timer out, please enter the BIOS Setup the <Peripheral Setup> menu, the <OnBoard PCI IDE> and <IDE Prefetch> these two items must set to Primary.

Time Factor

Time-Out Period (Seconds)

0C0H

3

0C1H

6

0C2H

12

0C3H

18

0C4H

24

0C5H

30

0C6H

36

0C7H

42

Table 5-2 Time-Out Setting

5-7

Page 38 Page 40
Image 39
Page 38 Page 40
Contents 386SX CPU Card Page Table of Contents Programming RS-485 & Index Bios ConsoleSpecifications & SSD Types Supported Using Memory Banks Placement & DimensionsPreface Organization Static Electricity PrecautionsOverview IntroductionPacking List Features DMA Controller System ControllerMicroprocessor DMA ControllerInterrupt Controller Keyboard ControllerI/O Port Address Map 1 I/O Port Address Map2 I/O Channel Pin Assignment Bus Hex Range DeviceI/O Channel Pin Assignments Real-Time Clock & Non-Volatile RAM TimerREAL-TIME Clock and NON-VOLATILE RAM Address DescriptionTransmitter Holding Register THR Interrupt Enable Register IERSerial Port Receiver Buffer Register RBRModem Status Register MSR Line Control Register LCRModem Control Register MCR Line Status Register LSRPrinter Interface Logic Parallel PortDivisor Latch LS, MS Register AddressError Slct PE -ACK -BUSY Printer Status BufferPrinter Control Latch & Printer Control Swapper Page Overview Setting UP the SystemAUX. Keyboard Connector J4 System SettingKeyboard Connector Pin Mini DIN Keyboard Connector CN32 PC/104 Connector Pin PC/104 Connector Bus C & D CN1Pin PC/104 Connector Bus a & B CN2 Name Description O Channel Signal DescriptionHDD Pin Assignment Hard Disk IDE Connector CN4I/O Channel Signal’s Description Pin SignalFDD Port Connector CN5 Parallel Port Connector CN6CN6 External RS-485 Adapter Select J6 & J7 Serial PortRS-232/RS-485 Select for COM-B JP2 RS-485 Terminator JP7LED Header Reset Header J1RS-232 Connector CN7 & DB2 External Power LED Header J2External Speaker Header J5 Power Connector J3External Battery Battery Charger Select JP3SIMM1 SIMM2 Dram ConfigurationExternal Battery Connector J11 CPU Base Clock Select JP1IRQ 9 Used Select Connecting the CRT MonitorVGA Setting JP5 CRT/LCD Flat Panel DisplayLCD Flat Panel Display CRT Connector DB1Inverter Board Description LCD ConnectorDE/E Signal from M or LP Select JP6 JP6 LCD Control Connector CN9Manufacture Model No Description LCD Panel Display Connector CN8Supported LCD Panel LCD Display AssignmentUtility Diskette InstallationStep VGA DriverWIN 3.1 Driver WIN 95 DriverSSD Utility RFG.EXE RFGDEMO.PGF Write Protect FunctionSoftware Write Protect Enable the Software Write ProtectDisable the Software Write Protect Hardware Write ProtectLED Watchdog TimerWatchdog Timer Setting Time-Out SettingWatchdog Timer Enabled Watchdog Timer TriggerWatchdog Timer Disabled Solid State Disk Switch SettingDEVICE=C\DOS\EMM386.EXE X=C800-C9FF Overview2 I/O Port Address Select SW1-1 SSD Firmware Address Select SW1-2SSD Drive Number SW1-3 & SW1-4 Simulate 2 Disk DriveFlash Eprom Sram Disk Drive Name Arrangement ROM Type Select SW1-5 & SW1-6M1~M3 & JP4 Memory Type Setting Jumper SettingROM Disk Installation Switch and Jumper SettingUV Eprom 27Cxxx Large Page 5V Flash Disk Software ProgrammingJP4 \PGM137X ROM pattern file name Small Page 5V Flash ROM Disk Using Tool ProgramRAM Disk Typing DOS Command\FORMAT RAM disk letter /U Combination of ROM and RAM DiskPage Bios Setup Overview Bios ConsoleHard Disk Setup Standard Cmos SetupDate & Time Setup Floppy SetupAdvanced Cmos Setup System Keyboard Password CheckWait for ‘F1’ If Error Hard Disk DelayAdvanced Chipset Setup Load Default Setting Password SettingSetting Password Password CheckingBios Update Auto Configuration with Fail Safe SettingBios Exit Save Settings and ExitFile of AMIFLASH.EXE had to Version Specifications & SSD Types Supported SpecificationsSSD Types Supported Fujitshu AtmelSST WinbondSocket Using Memory BanksRegister Port CS1 CS0Page Placement Placement & DimensionsDimensions Send out one character Transmit Programming RS-485 & IndexProgramming RS-485 Initialize COM portINPSTR$ Return OUT &H3FC, INP%H3FC and &HFA ReturnPrint #1, OUTCHR$ OUT &H3FC, INP&H3FC and &HEF ReturnName Function

386SX, AR-B1376, AR-B1375 specifications

The Toshiba AR-B1375 and AR-B1376 are notable embedded computing solutions that incorporate the 386SX microprocessor architecture. Designed for various applications, these models focus on reliability, performance, and versatility, making them appealing choices for system integrators and developers.

At the core of the AR-B1375 and AR-B1376 is the Intel 386SX microprocessor. This landmark processor marked a significant advancement in computing technology, introducing a 32-bit architecture while maintaining compatibility with 16-bit applications. The 386SX is known for its efficient processing capabilities, offering both multitasking support and enhanced memory management. It operates at clock speeds ranging typically from 16 MHz to 25 MHz, contributing to its effectiveness in running industrial applications.

One of the key features of the AR-B1375 and AR-B1376 systems is their modular architecture, which allows for easy customization and expansion. This modularity means users can tailor the hardware according to specific requirements, making it suitable for a wide range of applications such as automation, telecommunications, and embedded systems.

Both models support various I/O options, ensuring seamless integration with peripherals and external devices. They typically come equipped with serial and parallel ports, as well as support for modern interfaces like USB. The systems also feature onboard expansion slots, enabling the addition of further functionality, such as additional memory or specialized processing units.

In terms of memory, the AR-B1375 and AR-B1376 support a range of RAM configurations, allowing users to scale their systems based on the application demands. The inclusion of EPROM and EEPROM options also facilitates easy updates and programmability, which is crucial for embedded systems that often require firmware adjustments over time.

Moreover, these models are known for their robust thermal management features, which are essential in industrial environments where conditions can be harsh. This capability ensures stable performance and longevity, reducing the risk of system failures due to overheating or environmental factors.

To summarize, the Toshiba AR-B1375 and AR-B1376, coupled with the 386SX microprocessor, offer a blend of performance, flexibility, and reliability. Their modular design, extensive I/O support, and memory scalability make them ideal for a variety of embedded computing applications, placing them as commendable options in the world of industrial computing solutions. These systems not only exemplify Toshiba's commitment to innovation but also contribute significantly to the functionality of embedded technologies in a rapidly evolving industry.
Top Page Image Contents