Hi,

I need a bit of help with modifying some disassembled code. The original code ran the Serial port in Mode 2 at 375K.
I need to be able to communicate between the controller and my PC, so needed to change it to 8 bit at a lower speed. Also, both Timer's 0 and 1 were already being used, so I have to use Timer 2.

I ended up with the following settings:

MOV 0CBH,#0FDH ;RCAP H = FDh
MOV 0CAH,#08FH ;RCAP L = 8Fh
MOV 0C8H,#026H ;setup timer 2 - 00100110
MOV SCON,#050H ;setup SCON

Is this correct the correct way to do it?

The Serial Interrupt Handler is as follows:

JBC TI,L0058 ;SI handler
JNB RI,L0058
AJMP L0032

L0032 PUSH ACC
PUSH PSW
MOV PSW,#018H
MOV R1,SBUF
CLR RI
MOV A,@R1
JNB RB8,L0052
MOV R0,#00FH
MOVX A,@R0
ADD A,#0FCH
MOVX A,@R1
JC L0052
CLR EA
INC P2
MOVX A,@R1
DEC P2
SETB EA
;
L0052 MOV SBUF,A
POP PSW
POP ACC
;
L0058 RETI

This code seems to get the RAM at the address you send, then sends the contents of that address back. I'm pretty sure that I need to modify the code to change RCLK and TCLK but I'm not sure exactly how. Also, because it's no longer 9-bit, the RB8 bit is no longer being properly set - what do I do about that??

Sorry for the length of the post - I'm just a it lost (and frustrated) at the moment. I thought I had it modified properly, but for some reason my characters were just getting echoed.

Any help would be greatly appreciated,

George Ricketts