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SPD6722QCCE 参数 Datasheet PDF下载

SPD6722QCCE图片预览
型号: SPD6722QCCE
PDF下载: 下载PDF文件 查看货源
内容描述: ISA到PC卡( PCMCIA )控制器 [ISA-to-PC-Card (PCMCIA) Controllers]
分类和应用: 总线控制器微控制器和处理器PC
文件页数/大小: 138 页 / 837 K
品牌: INTEL [ INTEL ]
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ISA-to-PC-Card (PCMCIA) Controllers PD6710/22  
The Index register (see Operation Registerson page 41) is used to specify which of the internal  
registers the CPU will access next. The value in the Index register is called the Register Index.  
This number specifies a unique internal register. The Data register is used by the CPU to read and  
write the internal register specified by the Index register.  
Figure 8. Indexed 8-Bit Register Structure  
Internal Registers  
FFh  
FEh  
Register  
Indexes  
02h  
01h  
00h  
High Byte  
Data  
3E1h  
Low Byte  
Index  
3E0h  
I/O Addresses  
Figure 9. Indexed 8-Bit Register Example  
Internal Registers  
The following code segment demonstrates use  
of an indexed 8-bit register:  
Register  
Indexes  
mov dx, 3E0h  
mov al, 02h  
mov ah, 3Ch  
out dx, ax  
3Ch  
02h  
AH  
AL  
3Ch  
02h  
3E1h  
3E0h  
I/O Addresses  
Double-Indexed Registers  
The PD67XX has Extension registers that add to the functionality of the 82365SL-compatible  
register set. Within the Extension registers is an Extended Index register and Extended Data  
register that provide access to more registers. The registers accessed through Extended Index and  
Extended Data are thus double indexed. The example below shows how to access the Extension  
Control 1 register, one of the double-indexed registers.  
;Write to Extension Control 1 register example  
;Constants section  
Extended_Index  
Index_Reg  
Ext_Cntrl_1  
PD67XX_Index  
EQU 2Eh  
EQU 2Fh  
EQU 03h  
EQU 3E0h  
;Code section  
mov  
mov  
mov  
dx, PD67XX_Index  
al, Extended_Index  
ah, Ext_Cntrl_1  
Datasheet  
37  
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