prog_rom.04

描述：LED示范、按钮及开关、视频输出、键入、含Xilinx PicoBlaze微处理器的存储器模块

;set up the X and Y coordinates
LOAD s0, 00
LOAD s1, 00

INPUT sE, 2C

loop_y:

loop_x:

;go to the given cell
OUTPUT s0, 30
OUTPUT s1, 31

;output character 0xDF
LOAD s7, 00
OUTPUT s7, 32
OUTPUT s7, 33

;increment x and test for final value
ADD s0, 01
LOAD s7, s0
SUB s7, 28
JUMP NZ, loop_x

;reset x and increment y
LOAD s0, 00
ADD s1, 01
LOAD s7, s1
SUB s7, 0F
JUMP NZ, loop_y


LOAD s7, E0
OUTPUT s7, 33

LOAD s0, 00
OUTPUT s0, 30
OUTPUT s0, 31

LOAD s1, 48 ;H
CALL dump_char

LOAD s1, 65 ;e
CALL dump_char

LOAD s1, 6C ;l
CALL dump_char

LOAD s1, 6C ;l
CALL dump_char

LOAD s1, 6F ;o
CALL dump_char

LOAD s1, 20 ;
CALL dump_char

LOAD s1, 57 ;W
CALL dump_char

LOAD s1, 6F ;o
CALL dump_char

LOAD s1, 72 ;r
CALL dump_char

LOAD s1, 6C ;l
CALL dump_char

LOAD s1, 64 ;d
CALL dump_char

LOAD s1, 21 ;!
CALL dump_char

start:
JUMP start

dump_char:
OUTPUT s0, 30
OUTPUT s1, 32
ADD s0, 01
RETURN