ex3a.asm

来自「基于单片机、nrf24e1发射接受程序」· 汇编 代码 · 共 30 行

;= ex3a.asm ====================================================================
;
; Copyright (C) 2003 Nordic VLSI ASA
; 
; Author(s)     : Ole Saether
; Support mail  : [e-mail]
;
; DESCRIPTION:
;
;   PWM example program.
;
;   The functionality is the same as in ex3c.c.
;
; ASSEMBLER:
;  
;   You need as31.exe to assemble this program. it can be downloaded from this
;   web page: http://www.pjrc.com/tech/8051/
;
; $Revision: 1 $
;
;===============================================================================
                 .equ    P0_ALT,     0x95
                 .equ    PWMCON,     0xa9
                 .equ    PWMDUTY,    0xaa

                 mov     P0_ALT, #0x80   ; Enable PWM output
                 mov     PWMCON, #0xc0   ; Enable 8 bit PWM with min prescaler                 
                 mov     PWMDUTY, #10    ; High 10 out of 255 periods
here:            sjmp    here