init_54x.asm

来自「声音均衡器的源代码程序」· 汇编 代码 · 共 30 行

*****************************************************************************
* FILENAME:  INIT_54x.ASM
* After reset, ST0, ST1, PMST and other memory mapped  registers
* reconfigured at a known state.
*****************************************************************************
                .include "init_54x.inc"          ; contains all the initial
                                                 ; values of ST0, ST1, PMST, SWWSR,
                                                 ; BSCR
                .mmregs

K_INIT_DP       .set  0

                .text
	
init_54:
* initialize the status and control registers
                ST0 = #K_ST0
                ST1 = #K_ST1
                PMST = #K_PMST
	
* wait states for Bank Switch
                BSCR = #K_BSCR                    ; 0 wait states for BANK
                                                  ; SWITCH
	
* Init. the s/w wait state reg.for 2 wait states for I/O operations
                dreturn
                SWWSR = #K_SWWSR_IO               ; 2 wait states for I/O
                                                  ; operations