We have developed a board to program (via ISP - FM) the P89C51RD2.
The board has a USB interface through a FTDI chip and a "normal" RS-232 interface and is used in students labs.
After some time we "run out" of P89C51RD2.
I read a post in Keil forum, http://www.keil.com/forum/docs/thread10439.asp by erik malund, about the replacement part, since I cannot manage myself in the NXP site. In that post the 89V51RD2 was mentioned. Placed an order ... waited a long while ... and tested the parts to no success at all.
Found information in this forum about the new bootloader and I do suspect that the FTDI chip is generating some garbage at power on that simple makes the 89V51 to go crazy.
Also this afternoon tried to program the parts with the v7 bootloader using a parallel programmer, unfortunately I wasn't able to program more than a few bytes (around 300) in block 1. Could be adapter related or programmer problem, will have to check it again.
My questions are, if I manage to program the v7 bootloader will I be able to configure it using the "true RS-232" port using FM in order to be able to enter ISP through pulling a pin high during reset?
Should I forget about these parts and buy the 89cv51rd2 instead?
Is there anyway of parallel programming the part in order to change the bootloader to enter ISP directly if pin P2.x is pulled (low or high) during a reset?
Thanks in advance
The board has a USB interface through a FTDI chip and a "normal" RS-232 interface and is used in students labs.
After some time we "run out" of P89C51RD2.
I read a post in Keil forum, http://www.keil.com/forum/docs/thread10439.asp by erik malund, about the replacement part, since I cannot manage myself in the NXP site. In that post the 89V51RD2 was mentioned. Placed an order ... waited a long while ... and tested the parts to no success at all.
Found information in this forum about the new bootloader and I do suspect that the FTDI chip is generating some garbage at power on that simple makes the 89V51 to go crazy.
Also this afternoon tried to program the parts with the v7 bootloader using a parallel programmer, unfortunately I wasn't able to program more than a few bytes (around 300) in block 1. Could be adapter related or programmer problem, will have to check it again.
My questions are, if I manage to program the v7 bootloader will I be able to configure it using the "true RS-232" port using FM in order to be able to enter ISP through pulling a pin high during reset?
Should I forget about these parts and buy the 89cv51rd2 instead?
Is there anyway of parallel programming the part in order to change the bootloader to enter ISP directly if pin P2.x is pulled (low or high) during a reset?
Thanks in advance