參數資料
型號: 21921
英文描述: Low-Frequency, Spread-Spectrum EconOscillator
中文描述: 接口1 Am186CC通信控制器到AMD斯坦福線性加速器中心設備使用增強的小型工業(yè)應用筆記? 57.1KB(PDF格式)
文件頁數: 8/12頁
文件大小: 57K
代理商: 21921
A-2
Interfacing the Am186CC Controller to an AMD SLAC Device Using Enhanced SSI
mov dx,PIOMODE0 // point to mode register
in ax,dx // read register (in IO space)
and ax,0xE3FF // set bits low (to turn on SSI)
out dx,ax // write to register (in IO space)
mov dx,PIODIR0 // point to PIO1 DIRECTION register
in ax,dx // read
and ax,0xE3FF // set bit low (to turn on SSI)
out dx,ax // write
mov dx,SSSTAT // point to sync serial control register
mov ax,0x8000 // set ENHCTL (turn on enhancements)
out dx,ax // write
mov dx,SSCON // point to sync serial control register
mov ax,0x0130 // set clk divisor to 16, MSB first
out dx,ax // write
} /* end _asm */
}
// Bit Settings for SSCON:
//
// CLKP = 0 ;low active clock
// DENP = 0 ;low active SDEN0
// MSBF = 1 ;send msb first
// CLKEXP = 011 ;divide processor clock by 16
// DE1 = 0 ;don’t start transmission yet
// DE0 = 0 ;ditto
//
//============================ END OF SLAC_INIT =============================
Uint8 SLAC_read(void)
{
int i;
_asm{
mov dx,SSCON // STEP 1 - enable reception
in ax,dx // (i.e. set bit DE0 = 1)
or ax,DE0_HI //
out dx,ax //
mov dx,SSRXD // STEP 2 - start reception
in ax,dx // (with dummy read of SSR)
mov dx,SSSTAT // STEP 3 - wait for data
h1: in ax,dx // (done when PB = 0)
and ax,PB_HI //
jnz h1 //
mov dx,SSCON // STEP 4 - disable reception
in ax,dx // (set DE0 low)
and ax,DE0_LOW //
out dx,ax //
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