w83637hg Winbond Electronics Corp America, w83637hg Datasheet - Page 105

• Manufacturer Part Number: w83637hg
• Description: Winbond Lpc I/o Lpc I/o
• Manufacturer: Winbond Electronics Corp America

First, write the Logical Device Number (i.e., 0x07) to the EFIR and then write the number of the desired
logical device to the EFDR. If accessing the Chip (Global) Control Registers, this step is not required.
Secondly, write the address of the desired configuration register within the logical device to the EFIR
and then write (or read) the desired configuration register through EFDR.
8.1.2.3 Exit the extended function mode
To exit the extended function mode, one write of 0xAA to EFER is required. Once the chip exits the
extended function mode, it is in the normal running mode and is ready to enter the configuration mode.
8.1.2.4 Software programming example
The following example is written in Intel 8086 assembly language. It assumes that the EFER is located
at 2Eh, so EFIR is located at 2Eh and EFDR is located at 2Fh. If HEFRAS (CR26 bit 6) is set, 4Eh can
be directly replaced by 4Eh and 2Fh replaced by 4Fh.
;-----------------------------------------------------------------------------------
; Enter the extended function mode ,interruptible double-write
;-----------------------------------------------------------------------------------
MOV
MOV
OUT
OUT
;-----------------------------------------------------------------------------
; Configuration logical device 1, configuration register CRF0
;-----------------------------------------------------------------------------
MOV
MOV
OUT
MOV
MOV
OUT
;
MOV
MOV
OUT
MOV
MOV
OUT
;------------------------------------------
; Exit extended function mode
;------------------------------------------
MOV
MOV
OUT
DX,2EH
AL,87H
DX,AL
DX,AL
DX,2EH
AL,07H
DX,AL
DX,2FH
AL,01H
DX,AL
DX,2EH
AL,F0H
DX,AL
DX,2FH
AL,3CH
DX,AL
DX,2EH
AL,AAH
DX,AL
; point to Logical Device Number Reg.
; select logical device 1
; select CRF0
; update CRF0 with value 3CH
|
- 100 -
|
|
Publication Release Date: March, 2006
W83637HF/HG
Revision 1.6