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© Copyright 2009 Acnodes, Inc.
All rights reserved. Product description and product specifications
are subject to change without notice. For latest product information,
please visit Acnodes’ web site at www.acnodes.com.
661 Brea Canyon Rd., Suite 3
Walnut, CA 91789
tel: 909.598.7388, fax: 909.598.0218, www.acnodes.com
FES7611
Fanless Embedded Controller comes with
Intel Celeron M ULV 1.0GHz Processor
3.8 Watchdog Timer Configuration
The I/O port address of the watchdog timer is 2E(hex) and 2F(hex). 2E (hex) is the address port.
2F(hex) is the data port. User must first assign the address of register by writing address value into
address port 2E(hex), then write/read data to/from the assigned register through data port 2F (hex).
Configuration Sequence
To program W83627HF configuration registers, the following configuration sequence must be fol-
lowed:
(1) Enter the extended function mode
(2) Configure the configuration registers
(3) Exit the extended function mode
(1) Enter the extended function mode
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).
(2) Configurate the configuration registers
The chip selects the logical device and activates the desired logical devices through Extended Func-
tion 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. 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.
(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.