SBC81870 Intel
®
Pentium
®
M w/ DDR/VGA/Dual LAN
Software Utilities
51
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.
Example Program
1. Enable watchdog timer and set 30 sec. as timeout interval
;-----------------------------------------------------------
Mov dx, 2eh ; Enter to extended function mode
Mov al, 87h
Out dx, al
Out dx, al
;-----------------------------------------------------------
Mov al, 07h ; Select Logical Device 8 of watchdog timer
Out dx,al
Inc dx
Mov al, 08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Set second as counting unit
Mov al, 0f5h
Out dx,al
Inc dx
In al,dx
And al,not 08h
Out dx,al
