W83697UG Nuvoton Technology Corporation of America, W83697UG Datasheet - Page 24

• Manufacturer Part Number: W83697UG
• Description: IC LPC SUPER I/O 128-PQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83697UG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Supplier Unconfirmed, Lead free / RoHS Compliant

6.3.1
To place the chip into the extended function mode, two successive wrtites of 0x87 must be applied to
Extended Function Enable Registers (EFERs, i.e. 2Eh or 4Eh).
6.3.2
The chip selects the logical device and activates the desired logical devices through Extended
Function Index Register (EFIR) and Extended Function Data Register (EFDR). EFIR is located at the
same address as EFER, and EFDR is located at address (EFIR+1).
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.
6.3.3
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.
6.3.4
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 AL,87H
OUT
OUT
;-----------------------------------------------------------------------------
; Configurate logical device 1, configuration register CRF0 |
;-----------------------------------------------------------------------------
MOV
MOV
OUT
MOV
MOV
OUT
;
MOV
Enter the extended function mode
Configurate the configuration registers
Exit the extended function mode
Software programming example
DX,2EH
DX,AL
DX,AL
DX,2EH
AL,07H
DX,AL
DX,2FH
AL,01H
DX,AL
DX,2EH
; point to Logical Device Number Reg.
; select logical device 1
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W83697UF/W83697UG
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