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Re: EEPROM的問題，我想使用0x100~0x3ff的位址。謝謝！
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版主
 
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可以的，直接填16進制的值應該比較好吧!
發表於: 2007/6/10 22:21
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Re: EEPROM的問題，我想使用0x100~0x3ff的位址。謝謝！
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中級會員
 
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不好意思~
請問我這樣算高位元及低位元的方法是對的嗎？ 例如：0x3FF=1023 所以 1023/256=3(填入EEADRH) 1023%256=255(填入EEADR) EEADRH=3; EEADR=255; 謝謝~
發表於: 2007/6/10 0:11
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Re: EEPROM的問題，我想使用0x100~0x3ff的位址。謝謝！
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版主
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還需要 2-bit 的最高位址的設定，PIC18F8722 多了一個 EEADRH 暫存器就是來設定的，詳細請參考Data Sheet 第8章的說明 :
8.1 EEADR and EEADRH Registers The EEADRH:EEADR register pair is used to address the data EEPROM for read and write operations. EEADRH holds the two MSbs of the address; the upper 6 bits are ignored. The 10-bit range of the pair can address a memory range of 1024 bytes (00h to 3FFh).
發表於: 2007/6/8 20:57
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EEPROM的問題，我想使用0x100~0x3ff的位址。謝謝！
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中級會員
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下面這2個函試是我在範例程式抓來使用的。
我在寫入跟讀取的Address都只能使用到0xff 但是我使用的18f8722有1Kbytes的eeprom(0x00~0x3ff) 請問我要如何使用0xff之後的位址呢？ 我都是這樣寫的: EE_Write(0xff,mydata); 也就是EE_Write(0x00~0xff,mydata); 都可以正常的使用 但是EE_Write(0x100~0x3ff,mydata); 只要超過了0xff都只會寫到0xff的位址中。 請問應該要怎麼寫，才能寫到0x100~0x3ff中呢？ 謝謝~ void EE_Write (unsigned char EE_Address, unsigned char EE_Data) { PIR2bits.EEIF = 0; EEADR = EE_Address; EEDATA = EE_Data; EECON1bits.EEPGD = 0; EECON1bits.WREN = 1; INTCONbits.GIE = 0; _asm MOVLW 0X55 MOVWF EECON2,0 MOVLW 0XAA MOVWF EECON2,0 BSF EECON1,1,0 _endasm INTCONbits.GIE = 1; while (!PIR2bits.EEIF); PIR2bits.EEIF = 0; EECON1bits.WREN = 0; } unsigned char EE_Read (unsigned char EE_Address) { EEADR = EE_Address; EECON1bits.EEPGD = 0; EECON1bits.RD = 1; return EEDATA; }
發表於: 2007/6/8 20:12
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