prog_rom.psm

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

start:

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

INPUT sE, 2C
LOAD sF, sE
SL0 sF
SL0 sF
SL0 sF
SL0 sF
ADD sE, sF

loop_y:

loop_x:

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

;output the background and foreground
LOAD s7, s0
SR0 s7
ADD s7, s1
ADD s7, sE
OUTPUT s7, 34

LOAD s7, s1
SR0 s7
ADD s7, s0
ADD s7, sE
OUTPUT s7, 35

;output character 0xDF
LOAD s7, DF
OUTPUT s7, 32

;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

;the drawing is done

JUMP start