參數(shù)資料
型號: DZPD6710VCB
廠商: INTEL CORP
元件分類: 總線控制器
英文描述: ISA-to-PC-Card (PCMCIA) Controllers
中文描述: PCMCIA BUS CONTROLLER, PQFP144
封裝: LQFP-144
文件頁數(shù): 37/138頁
文件大?。?/td> 723K
代理商: DZPD6710VCB
ISA-to-PC-Card (PCMCIA) Controllers
PD6710/
22
Datasheet
37
The
Index
register (see
Operation Registers
on 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.
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
Figure 8. Indexed 8-Bit Register Structure
Figure 9. Indexed 8-Bit Register Example
00h
01h
02h
FEh
FFh
3E1h
3E0h
Internal Registers
Register
Indexes
I/O Addresses
Data
Index
High Byte
Low Byte
The following code segment demonstrates use
of an indexed 8-bit register:
mov dx, 3E0h
mov al, 02h
mov ah, 3Ch
out dx, ax
02h
3E1h
3E0h
Internal Registers
Register
Indexes
I/O Addresses
3Ch
02h
3Ch
AH
AL
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