Hello all,

I'm a beginer in C programming as I've metioned in previous post, so please bear with me.
I use uVision IDE to start new project, and it generates a Startup file for me but for LPC family. In order to use it I have to modify the file. I modified the Startup file to fit my MCU. It's Philips 87C785, and I came across some thing that puzzles me. I've looked in Keil manual but couldn't find the answer.

Here is modified version.

IDATALEN        EQU     40H     ; the length of IDATA memory in bytes.

IBPSTACK        EQU     0       ; set to 1 if small reentrant is used.

IBPSTACKTOP     EQU     03FH+1  ; set top of stack to highest location+1.


                NAME    ?C_STARTUP

?C_C51STARTUP   SEGMENT   CODE
?STACK          SEGMENT   IDATA

                RSEG    ?STACK
                DS      1

                EXTRN CODE (?C_START)
                PUBLIC  ?C_STARTUP

                CSEG    AT      0
?C_STARTUP:     JMP     STARTUP1

                RSEG    ?C_C51STARTUP

STARTUP1:

IF IDATALEN <> 0 
                MOV     R0,#IDATALEN - 1
                CLR     A
IDATALOOP:      MOV     @R0,A
                DJNZ    R0,IDATALOOP
ENDIF


IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)

                MOV     ?C_IBP,#LOW IBPSTACKTOP
ENDIF

                MOV     SP,#?STACK-1
                JMP     ?C_START

                END

I know the STARTUP1 section is to clear memory, but the lines in bold I don't understant what it's for, especially the sign < >. What does it mean?
Second, do I have to worry about the Stack pointer? There is any chance that I got SP overflow? If coding in assembly I would relocate it to upper memory and assign a certain memory block for it and don't have to worry any more. In this startup file I see that they reserved only 1 by for SP. This worries me a bit because it seems to be too little. Each call to a subroutine takes 2 byte of stack. If it's a nest call then it would take more.
Could someone please spend some time clear these thing out for me. Any input will be greatly appreciated. Have a great weekend.
Please advise if you think something is not right with the modified version.

Best regards,
T.L