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Re: udata的問題
#2
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版主


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UDATA 是宣告 Un-Initialize Data,它須與虛指令 RES 共用,以上面的例子:

; Internal registers
.registers udata_ovr 0x0000 ; 強定RAM 起始位址從 0x0000 開始擺放變數
r0x00 res 1 ; 保留一個 BYTE給變數 r0x00
r0x01 res 1
r0x02 res 1

使用RES 所宣告的變數不管有沒有用道都會佔有一實際的空間。

發表於: 2006/6/30 11:40
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udata的問題
#1
初級會員
初級會員


查看用戶資訊
; Internal registers
.registers udata_ovr 0x0000
r0x00 res 1
r0x01 res 1
r0x02 res 1
r0x03 res 1
r0x04 res 1

udata_sdccTest_0 udata
_p res 3

udata_sdccTest_1 udata
_gint res 2

請問一下,當我用udata來定義reg的時候, 這些registers.......是不是在程式中使用到的時候,才會佔用空閒的SRAM,還是說這些registers.......,都是佔用固定的SRAM

發表於: 2006/6/27 17:46
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