Re: [Sdcc-user] Proper warmboot routine?

[Fiorenzo D. R. <fd....@ti...>]

----- Original Message ----- 
From: "Thorsten Godau" <tho...@gm...>
To: <sdc...@li...>
Sent: Thursday, February 20, 2003 1:13 PM
Subject: [Sdcc-user] Proper warmboot routine?


> has someone ever written a proper warmboot routine
> for MCS51?

Hello,

my boot initializes all registers and clears internal RAM.
Here an example for 89c51rx2 (in assembler) :

 ORG       0000h
;
          LJMP      reset     ;power-on/reset


;
; power-on/reset
;
reset:
 MOV       SP, #<stack begin>
 MOV       P0, #11110000b
 MOV       P1, #01111111b
 MOV       P2, #11111111b
 MOV       P3, #11111111b
 MOV       PCON, #00010000b
 MOV       TCON, #00000000b
 MOV       RCAP2L, #LOW(-5)
 MOV       RCAP2H, #HIGH(-5)
 MOV       TL2, #LOW(-5)
 MOV       TH2, #HIGH(-5)
 MOV       T2MOD, #00000000b
 MOV       T2CON, #00110100b
 MOV       SCON, #11010000b
 MOV       CCAP0L, #LOW(10000)
 MOV       CCAP0H, #HIGH(10000)
 MOV       CCAPM0, #01001101b
 MOV       CCAPM1, #00000000b
 MOV       CCAPM2, #00000000b
 MOV       CCAPM3, #00000000b
 MOV       CCAPM4, #00000000b
 MOV       CMOD, #00000011b
 MOV       CCON, #01000000b
 MOV       AUXR, #00000000b
 MOV       AUXR1, #00000000b
 MOV       IE, #01010000b
 MOV       IP, #00000000b
 MOV       IPH, #00000000b
 MOV       PSW, #00000000b
 MOV       R0, #7Fh
res_1:    MOV       @R0, #0
 DJNZ      R0, res_1
;


Fiorenzo Ramaglia
Italy
fd....@ti...