option.inc.bak

来自「基于ARM 44b0的启动应到程序」· BAK 代码 · 共 59 行

;**********OPTIONS*******************************
_ISR_STARTADDRESS   EQU   0xc7fff00

;BUSWIDTH; 16,32
                GBLA    BUSWIDTH
BUSWIDTH	SETA    16

;"DRAM","SDRAM"
                GBLS    BDRAMTYPE
BDRAMTYPE	SETS    "SDRAM"

;This value has to be TRUE on ROM program.
;This value has to be FALSE in RAM program.
                GBLL    PLLONSTART
PLLONSTART      SETL    {TRUE}

	GBLA	PLLCLK
PLLCLK		SETA	60000000

;系统主频计算公式如下：
;Fout = (8 + M_DIV) * Fin / [ (2+P_DIV) * (2^S_DIV) ]

	[	PLLCLK = 40000000	
M_DIV	EQU	0x48	;Fin=10MHz Fout=40MHz
P_DIV	EQU	0x3
S_DIV	EQU	0x2		
	]

	[	PLLCLK = 50000000	
M_DIV	EQU	0x2a	;Fin=10MHz Fout=50MHz
P_DIV	EQU	0x3
S_DIV	EQU	0x1	
	]

	[	PLLCLK = 60000000	
M_DIV	EQU	0x34	;Fin=10MHz Fout=60MHz
P_DIV	EQU	0x3
S_DIV	EQU	0x1
;M_DIV	EQU	0x34	;Fin=4MHz Fout=60MHz
;P_DIV	EQU	0x0
;S_DIV	EQU	0x1
;M_DIV	EQU	0x48	;Fin=3MHz Fout=60MHz
;P_DIV	EQU	0x0
;S_DIV	EQU	0x1
	]

	[	PLLCLK = 66000000	
M_DIV	EQU	0x3a	;Fin=10MHz Fout=66MHz
P_DIV	EQU	0x3
S_DIV	EQU	0x1		
	]

	[	PLLCLK = 75000000	
M_DIV	EQU	0x43	;Fin=10MHz Fout=75MHz
P_DIV	EQU	0x3
S_DIV	EQU	0x1		
	]
;************************************************
	END