Write a program in assembly language to control a sump pump. A sump well collect

Question

Write a program in assembly language to control a sump pump. A sump well collects water runoff. The sump pump pumps out the well whenever it fills up. When the level rises to a high limit, the pump turns on. It stays on until the level drops to a low limit. Then the pump shuts off. It does not turn on again until the well fills up to the high limit. Data is stored in the following three addresses:

The program needs to run on a M68HC11E Microcontroller Trainer Board. Here is a link to the programming guide for this trainer board.

http://www.freescale.com/files/microcontrollers/doc/ref_manual/M68HC11ERG.pdf

Address
Data
$00
High Limit
$1403
Level Reading (SW_PORT)
$1404
Pump Control (LED_PORT)
$10
Low Limit

Explanation / Answer

BEGIN

LDAA $1403 ; Loads current water level

  LDAB $0000 ; Loads low limit of water level

CBA ; Compares current level to low limit

BEQ OFF ; Jumps to instruction to turn pump off

LDAB $00FF ; Loads high limit of water level

CBA ; Compares current level to high limit

BEQ ON ; Jumps to instruction to turn pump on

BRA BEGIN ; Repeats the program

OFF

  LDAA #$10 ; Loads ACCA with $10 (signal for off)

  STAA $1404 ; Sends signal to pump control or LED in testing

  BRA BEGIN ; Repeats program

ON

LDAA #$00 ; Loads ACCA with $00 (signal for on)

STAA $1404 ; Sends signal to pump control or LED in Testing

BRA BEGIN ; Repeats program

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