How to get rid of SoftICE mode in P89V51RD2.

Disclaimer:

No warranty that this will work for your device.
No liability for damages, lost devices etc.
Do everything on your onwn risk.

Assuming bootloader v4 and softice mode (consequence of :00000002FE).

download and install Keil uVision2 (evaluation version is enough); run it
download unsoftice.a51
select Project->New Project, enter any name (e.g. "unsoftice"); a "select device for Target" window opens, select Philips->P89V51RD2, a dialog opens ("Copy Standard 8051 startuop code...") answer No
select File->Open, select unsoftice.a51; file should open
select Project->Components,Environments,Books, a window opens, in Project Components select Add Files, enter/browse unsoftice.a51
select Project->Build target, in the bottom (Outputs Window) it should write
```
 0 Error(s), 0 Warning(s).
```
select Project->Options for Project, Option for Project window opens, select tab Debug, select in the right column on top Use: Keil Monitor-51 driver, don't change anything else (unless the target device is not on COM1 - in that case modify it in the Options), click OK (window closes)
select Debug->Start/Stop debug session (in evaluation version a nag window EVALUATION VERSION (code limit 2k) opens, click OK), the windows rearrange a bit
select Debug-Go (nothing really happens), clicking on the red "Stop" button should bring a window saying something like "Can't stop application because serial interrupt is disabled". Click Stop debugging, wait for a moment until window "Connection to target lost" appears, click Stop Debugging.
you can exit Keil uVision2.

At this moment, the original state of bootloader is (hopefully) already restored.

Test:

- run your favorite terminal emulator, set 9600/8/n/1 NO_handshake. Switch CAPS LOCK ON (check led CapsLock on keyboard) and hold U (for autorepeated capital U). Reset the target (or switch off/on) while holding U. In a while, it should echo back the U's. Now try typing

:020000050000f9

it should echo what you type and when typing in the last character (="9") it should echo 2 more characters, a fullstop and a carriage return, so the echo should look like:

:020000050000f9BF.

Now you can upgrade the bootloader to version 5 (can be found on Philips website) or try some other bootloader modification...

31/01/2005 - wek at efton dot sk