W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 39

• Manufacturer Part Number: W83627DHG-PT
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG-PT

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

7.1.1
To place the chip into the Extended Function Mode, two successive writes of 0x87 must be applied to
Extended Function Enable Registers (EFERs, i.e. 2Eh or 4Eh).
7.1.2
The chip selects the Logical Device and activates the desired Logical Devices through Extended
Function Index Register (EFIR) and Extended Function Data Register (EFDR). The EFIR is located at
the same address as the EFER, and the 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 the EFDR.
7.1.3
To exit the Extended Function Mode, writing 0xAA to the 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.
7.1.4
The following example is written in Intel 8086 assembly language. It assumes that the EFER is located
at 2Eh, so the EFIR is located at 2Eh and the EFDR is located at 2Fh. If the HEFRAS (CR26 bit 6) is
set, 2Eh can be directly replaced by 4Eh and 2Fh replaced by 4Fh.
;-----------------------------------------------------
; Enter the Extended Function Mode
;-----------------------------------------------------
MOV
MOV
OUT
OUT
;-----------------------------------------------------------------------------
; Configure Logical Device 1, Configuration Register CRF0
;-----------------------------------------------------------------------------
MOV
MOV
OUT
MOV
MOV
OUT
;
MOV
Enter the Extended Function Mode
Configure the Configuration Registers
Exit the Extended Function Mode
Software Programming Example
DX, 2EH
AL, 87H
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
W83627DHG-P/W83627DHG-PT
-29-
Publication Release Date: July 09, 2009
Version 1.94