Re: 89C51ED2

From: Eeyore <rabbitsfriendsandrelations@xxxxxxxxxxx>
Date: Sun, 07 Sep 2008 07:08:06 +0100

MooseFET wrote:

"TT_Man" <Some...@xxxxxxxxxxxx> wrote:

">> > Now why does my code always start with an initialisation procedure for
variables

and the 8051 special function registers function I wonder ?

Mine usually starts:

LJMP Startup
.........................
StartUp:
MOV SP,#MainStack
MOV P1,#0FFH
MOV P2,#0FFH
MOV P3,#0FFH

WTF is that supposed to do ?

Set the stack pointer to where you want it to be- #mainStack
Set ports 1,2 and 3 to 0xFF
How hard is that?

Sorry I was missing the obvious P1, 2, 3 etc. I don't play with stacks myself.

Graham

.

Follow-Ups:
- Re: 89C51ED2
  - From: krw

References:
- Re: 89C51ED2
  - From: Robert Baer
- Re: 89C51ED2
  - From: MooseFET
- Re: 89C51ED2
  - From: Eeyore
- Re: 89C51ED2
  - From: MooseFET
- Re: 89C51ED2
  - From: Eeyore
- Re: 89C51ED2
  - From: TT_Man
- Re: 89C51ED2
  - From: MooseFET

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Relevant Pages

Re: 89C51ED2
... MooseFET wrote: ... Set the stack pointer to where you want it to be- #mainStack ... Set ports 1,2 and 3 to 0xFF ...
(sci.electronics.design)
Re: 89C51ED2
... krw wrote: ... Set the stack pointer to where you want it to be- #mainStack ... Set ports 1,2 and 3 to 0xFF ...
(sci.electronics.design)
Re: 89C51ED2
... Set the stack pointer to where you want it to be- #mainStack ... Set ports 1,2 and 3 to 0xFF ... It's dumb to leave the stack ...
(sci.electronics.design)
Re: 89C51ED2
... Set the stack pointer to where you want it to be- #mainStack ... Set ports 1,2 and 3 to 0xFF ... It's dumb to leave the stack ...
(sci.electronics.design)
Re: 89C51ED2
... Set the stack pointer to where you want it to be- #mainStack ... Set ports 1,2 and 3 to 0xFF ... It's dumb to leave the stack ...
(sci.electronics.design)