I have the following code lines that worked well with SDCC compiler: data at 0x90 unsigned char motor1 = 0; // PORT 1 (90h) data at 0xB0 unsigned char motor2; // PORT 3 (B0h) But, when it does't compile with Keil. I'm trying to control a step motor by setting the values of these ports. How can I declare these variables in a way Keil compiles OK? Thank you.
I don't want to include the reg51.h file im my code because I have space constraints, in that case, can I declare P1 as: sfr P1 = 0x90; Is that correct? Thank you.
"I don't want to include the reg51.h file im my code because I have space constraints..." reg51.h, or any other header file for that matter, unless improperly constructed, does not result in memory being allocated for any data or code objects it declares.