W83627EHG Nuvoton Technology Corporation of America, W83627EHG Datasheet - Page 42

• Manufacturer Part Number: W83627EHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EHG

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

To program the W83627EHF/EHG/EF/EG configuration registers, the following configuration
procedures must be followed in sequence:
(1). Enter the Extended Function Mode.
(2). Configure the configuration registers.
(3). Exit the Extended Function Mode.
6.1.1
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).
6.1.2
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.
6.1.3
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.
6.1.4
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 DX, 2EH
MOV
OUT DX, AL
Enter the Extended Function Mode
Configure the Configuration Registers
Exit the Extended Function Mode
Software Programming Example
AL, 87H
W83627EHF/EF, W83627EHG/EG
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Publication Release Date: April 7, 2009
Version 1.94