VIA Technologies EPIA-M Mini-ITX Manual de usuario descargar pdf (Pagina 17)

Mini-ITX Power Solutions Andrei Bulucea

Automotive Solutions Ituner Networks

DC-DC converters - 17 - Automotive Applications

ITPS Software

;

; Ituner power sequencer

;

; pd 030611 initial code

LIST p=12C508A ;Target processor

#include "P12C508A.INC" ;Header file for target processor

; GP0 = VSW12 input 1 = ignition turned on

; GP1 = ON output 1 = turn power on

; GP2 = MBON# o.d. 0 = power button pressed

; GP3 = n.c. input

; GP4 = MBON2# o.d. 0 = power button pressed (parallel out,

; makes connector flip-tolerant)

; GP5 = n.c. output 0 = terminate unused pin

; Equates

PWR_OFF equ 0x00 ;power off state

PWR_ON equ 0x02 ;power on state

SW_ON equ 0x09 ;direction for switch on

SW_OFF equ 0x1d ;direction for switch off

ONDELAY equ .15 ;power on delay 3 seconds

ONDELAY2 equ .5 ;wait 1 second until push button

BUTTON equ .2 ;push button for 400 ms

OFFDELAY equ .25 ;shut down 5 s after ignition off

HARDOFF equ .25;&&&225 ;hard off after 45 seconds

; Register variables

cblock 0x10

cntr ;state counter

cntr2 ;state counter

waitl ;delay counter low

waitm ;delay counter mid

waith ;delay counter high

endc

; ORG 0x1FF ; processor reset vector

; Internal RC calibration value is placed at location 0x1FF by Microchip

; as a movlw k, where the k is a literal value.

; Reset entry

org 0

reset movwf OSCCAL ;set oscillator calibration

movlw PWR_OFF ;set initial state

movwf GPIO

movlw SW_OFF ;set pin directions

tris GPIO

movlw b'11001101' ;set option register (pg. 17)

;disable wake-up on GP pin change

;disable weak pull-ups

;timer0 internal clock, positive edge

;prescaler -> WDT, 1:32 -> ~0.5s

option

clrwdt ;clear watchdog

; initial state - wait until ignition is on for ONDELAY

initial movlw ONDELAY ;initial power on

movwf cntr

initwait call delay200 ;wait

btfss GPIO,0 ;ignition on ?

goto initial ;no: clear counter

decfsz cntr,f ;initial time-out

goto initwait

; turn power on, wait ONDELAY2

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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VIA Technologies EPIA-M Mini-ITX Manual de usuario Pagina 17

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