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;;delay_us

#include <pkgconf/hal.h>        

#include <cyg/hal/arch.inc>     
#include <cyg/hal/basetype.h>
#include <cyg/hal/mod_regs_tmr.h>
        
#define DELAY_COUNT (CYGHWR_HAL_H8300_PROCESSOR_SPEED/1000000)*16/8
        
//      .file   "delay_us.S"
        .h8300h
        .text

        .global CYG_LABEL_DEFN(hal_delay_us)
CYG_LABEL_DEFN(hal_delay_us):
        mov.b   #0,r1l
        mov.b   r1l,@CYGARC_8TCNT2:8
        mov.b   r1l,@CYGARC_8TCSR2:8
        mov.b   #DELAY_COUNT+1,r1l
        mov.b   r1l,@CYGARC_TCORA2:8
        mov.b   #0x09,r1l
        mov.b   r1l,@CYGARC_8TCR2:8
        mov.b   #0,r2h
        sub.w   e1,e1
1:
        mov.l   er0,er0
        ble     3f
2:
        btst    #6,@CYGARC_8TCSR2:8
        beq     2b
        bclr    #6,@CYGARC_8TCSR2:8
        dec.l   #1,er0
        bra     1b
3:      
        mov.b   #0,r0l
        mov.b   r0l,@CYGARC_8TCR2
        rts