📄 44binit_s引导程序注释.mht
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cpsr_cxsf,r1 ;SVCMode <BR>ldr sp,=3DSVCStack <BR><BR>;USER mode is =
not=20
initialized. <BR>mov pc,lr ;The LR register may be not valid for =
the mode=20
changes. =
<BR>;=CF=C2=C3=E6=CA=C7pwdn=C4=A3=CA=BD=CF=C2=B5=C4=CF=E0=B9=D8=BC=C4=B4=E6=
=C6=F7=B5=C4=B6=A8=D2=E5=20
<BR>;**************************************************** <BR>;* =
The=20
function for entering power down mode *=20
<BR>;**************************************************** =
<BR>;void=20
EnterPWDN(int CLKCON); <BR>EnterPWDN <BR>mov r2,r0 ;r0=3DCLKCON =
<BR>ldr=20
r0,=3DREFRESH <BR>ldr r3,[r0] <BR>mov r1, r3 <BR>orr r1, r1, =
#0x400000=20
;self-refresh enable <BR>str r1, [r0] <BR><BR>nop ;Wait until =
self-refresh=20
is issued. May not be needed. <BR>nop ;If the other bus master =
holds the=20
bus, ... <BR>nop ; mov r0, r0 <BR>nop <BR>nop <BR>nop <BR>nop=20
<BR><BR>;enter POWERDN mode <BR>ldr r0,=3DCLKCON <BR>str r2,[r0]=20
<BR><BR>;wait until enter SL_IDLE,STOP mode and until wake-up =
<BR>mov=20
r0,#0xff <BR>0 subs r0,r0,#1 <BR>bne %B0 <BR><BR>;exit from =
DRAM/SDRAM=20
self refresh mode. <BR>ldr r0,=3DREFRESH <BR>str r3,[r0] =
<BR><BR>mov pc,lr=20
<BR><BR>LTORG =
<BR>;=D5=E2=CA=C7=C9=CF=C3=E6=CC=E1=B5=BD=B5=C4=B6=D4=B4=E6=B4=A2=BC=C4=B4=
=E6=C6=F7=B3=F5=CA=BC=BB=AF=B5=C4=CA=FD=BE=DDmap <BR>SMRDATA DATA=20
=
<BR>;*****************************************************************=20
<BR>;* Memory configuration has to be optimized for best =
performance *=20
<BR>;* The following parameter is not optimized. *=20
=
<BR>;*****************************************************************=20
<BR><BR>;*** memory access cycle parameter strategy *** <BR>; 1) =
Even=20
FP-DRAM, EDO setting has more late fetch point by half-clock <BR>; =
2) The=20
memory settings,here, are made the safe parameters even at 66Mhz. =
<BR>; 3)=20
FP-DRAM Parameters:tRCD=3D3 for tRAC, tcas=3D2 for pad delay, =
tcp=3D2 for bus=20
load. <BR>; 4) DRAM refresh rate is for 40Mhz. <BR><BR><BR>DCD =
0x11110090=20
;Bank0=3DOM[1:0], Bank1~Bank7=3D16bit, bank2=3D8bit; <BR>DCD=20
=
((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<&=
lt;6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC))=20
;GCS0 <BR>DCD=20
=
((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<&=
lt;6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC))=20
;GCS1 <BR>DCD=20
=
((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<&=
lt;6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC))=20
;GCS2 <BR>DCD=20
=
((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<&=
lt;6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC))=20
;GCS3 <BR>DCD=20
=
((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<&=
lt;6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC))=20
;GCS4 <BR>DCD=20
=
((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<&=
lt;6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC))=20
;GCS5 <BR>DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) =
;GCS6=20
<BR>DCD ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) ;GCS7 =
<BR>DCD=20
=
((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tc=
hr<<16)+REFCNT)=20
;REFRESH RFEN=3D1, TREFMD=3D0, trp=3D3clk, trc=3D5clk, =
tchr=3D3clk,count=3D1019=20
<BR>DCD 0x16 ;SCLK power mode, BANKSIZE 32M/32M <BR>DCD 0x20 =
;MRSR6=20
CL=3D2clk <BR>DCD 0x20 ;MRSR7 <BR><BR>ALIGN =
<BR><BR>;=CF=C2=C3=E6=CA=C7=B6=D4ram=C7=F8=D3=F2map=B5=C4=B6=A8=D2=E5=20
<BR>AREA RamData, DATA, READWRITE =
<BR>;=D5=E2=C0=EF=B6=A8=D2=E5=C1=CB=B4=A6=C0=ED=C6=F7=B9=A4=D7=F7=D3=DA=B8=
=F7=C4=A3=CA=BD=B5=C4=B6=D1=D5=BB=C7=F8=D4=DAram=D6=D0map <BR>^=20
(_ISR_STARTADDRESS-0x500) <BR><BR>UserStack # 256 ;c1(c7)ffa00=20
<BR>SVCStack # 256 ;c1(c7)ffb00 <BR>UndefStack # 256 ;c1(c7)ffc00=20
<BR>AbortStack # 256 ;c1(c7)ffd00 <BR>IRQStack # 256 ;c1(c7)ffe00=20
<BR>FIQStack # 0 ;c1(c7)fff00 =
<BR><BR>;=D5=E2=C0=EF=BD=AB=D6=D0=B6=CF=D2=EC=B3=A3=CF=F2=C1=BF=BD=A8=C1=A2=
=D4=DAsdram=D6=D0 <BR>^=20
_ISR_STARTADDRESS <BR>HandleReset # 4 <BR>HandleUndef # 4 =
<BR>HandleSWI #=20
4 <BR>HandlePabort # 4 <BR>HandleDabort # 4 <BR>HandleReserved # 4 =
<BR>HandleIRQ # 4 <BR>HandleFIQ # 4 <BR><BR>;Don't use the label=20
'IntVectorTable', <BR>;because armasm.exe cann't recognize this =
label=20
correctly. <BR>;the value is different with an address you think =
it may=20
be. <BR>;IntVectorTable <BR>HandleADC # 4 <BR>HandleRTC # 4=20
<BR>HandleUTXD1 # 4 <BR>HandleUTXD0 # 4 <BR>HandleSIO # 4 =
<BR>HandleIIC #=20
4 <BR>HandleURXD1 # 4 <BR>HandleURXD0 # 4 <BR>HandleTIMER5 # 4=20
<BR>HandleTIMER4 # 4 <BR>HandleTIMER3 # 4 <BR>HandleTIMER2 # 4=20
<BR>HandleTIMER1 # 4 <BR>HandleTIMER0 # 4 <BR>HandleUERR01 # 4=20
<BR>HandleWDT # 4 <BR>HandleBDMA1 # 4 <BR>HandleBDMA0 # 4 =
<BR>HandleZDMA1=20
# 4 <BR>HandleZDMA0 # 4 <BR>HandleTICK # 4 <BR>HandleEINT4567 # 4=20
<BR>HandleEINT3 # 4 <BR>HandleEINT2 # 4 <BR>HandleEINT1 # 4=20
<BR>HandleEINT0 # 4 ;0xc1(c7)fff84 <BR><BR>END=20
<BR></FONT></P></TD></TR></TBODY></TABLE>
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