User`s manual

PK2100

Appendix A: Troubleshooting s A-3

Dynamic C Will Not Start

If Dynamic C will not start, an error message on the Dynamic C screen

(for example, Target Not Responding or Communication Error),

announces a communication failure:

 Wrong Baud Rate  Either Dynamic Cs baud rate is not set correctly

or the PK2100s baud rate is not set correctly.

 Wrong System Clock Speed in EEPROM The EEPROM contains the

system clock speed as a word at location 108H in units of 1200baud.

If this number is incorrect, the PK2100 will try to communicate at the

wrong baud rate.

 Wrong Communication Mode  Both sides must be talking RS-232.

 Wrong COM Port  A PC generally has two serial ports, COM1 and

COM2. Specify the one used in the Dynamic C Target Setup menu.

Use trial and error, if necessary.

 Wrong Operating Mode  Communication with Dynamic C is lost

when the PK2100 is in run mode. Use the setup keys to reconfigure

the PK2100 for programming mode to communicate with DynamicC

at 19,200 baud or 38,400 baud.

 Wrong Jumper Setting  Jumpers on J4 override thee setup keys.

Make sure they are installed correctly.

 Wrong EPROM Size or Wrong Board Jumper  Jumper J1 is used to

specify the EPROMs size.

 If all else fails, connect the serial cable to the PK2100 after power-up.

If the PCs RS-232 port supplies a large current (most commonly on

portable and industrial PCs), some RS-232 level converter ICs go into

a nondestructive latch-up. Connecting the RS-232 cable after power-

up alleviates this problem.

Dynamic C Loses Serial Link

Dynamic C will lose its link if the program disables interrupts for more

than 50milliseconds. Make sure that interrupts are not disabled for more

than 50milliseconds.

PK2100 Resets Repeatedly

The PK2100 resets every 1.6seconds if the watchdog timer is not hit

and the watchdog timer is enabled by connecting pins 13 and 14 of J8.

Dynamic C hits the watchdog timer, but there may be problems running

the program if the program does not hit the watchdog timer. Make a call

to uplc_init at the start of the program to make sure the watchdog timer

is hit periodically in the background.