Topics

1

P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Failed to communicate

« on: May 01, 2014, 08:59:37 am »

Hi All,

Currently I have problem when try to communicate with the chip P89C51RD2HBA. I downloaded the hex files using the flash magic, then when try to simulate with the PCOMM emulator,  after the header come out, whenever I pressed any key , nothing displayed. This files was tested working fine before, but now having this problem. But when I tried using other hex files it's ok and can works well.

Has anyone facing the same problem and what is the possible possibility?

Thanks.
Any help highly appreciated

2

General / COM Port Handshaking using DB9-USB converter module

« on: December 31, 2013, 12:06:13 am »

Hi,

Currently, Flash Magic can be used to control the ISP mode by using COM port handshaking devices by automatically place into ISP mode and then automatically will execute the code at the end of the writing operation. The microcontroller used is P89C51RD2HBA and this operation was successfully done using the DB9 RS232 connector. However, now, i want to use the DB9-USB converter module from FTDI where all the pins were identical.

http://www.ftdichip.com/Support/Docu...-USB-RS232.pdf

The ISP mode can be controlled at first but, Now, the problem I'm facing was once it enter the ISP mode and execute the code,
it cannot enter the ISP mode anymore. Does FTDI converter module support the COM Port handshaking operation?

Any help highly appreciated.

Regards,

3

P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / ISP Entry using DTR and RTS

« on: June 07, 2013, 08:02:53 am »

Hello all,

I'm try to implement the DTR and RTS signal to enter the ISP mode and RESET.
However, I'm facing a problem with the DTR and RTS signal. Do i need to connect the DTR and RTS from RS232 directly into 74LS125 chip? Or I need a
RS232 tranceiver chip to connect these  DTR and RTS?

Any help highly appreciated.

Thanks.