Nexcom EBC 580, User Manual

Page: 24 / 30

EBC 580 User’s Manual
23
SIO entry configuration procedure
mov dx,SIO_PORT
mov al,SIO_ENTERY
out dx,al
nop
nop
out dx,al
Logical Device 7
mov dx,SIO_PORT
mov al,07h
out dx,al ;point to logical device number register
;
mov al,07h
inc dl
out dx,al ;select logical device 7
Reading Digit I/O data for register CRF1
mov dx,SIO_PORT
mov al,0F1h
out dx,al
inc dl
in al,dx ;You need data in AL register
SIO exit configuration procedure
mov dx,SIO_PORT
mov al,SIO_EXIT
out dx,al
◎
Watch Dog timer programming guide
WDT_CRWM EQU 0F3H
Logical Device 8
CRF3 (PLED mode register. Default 0x00)
Bit [7
：
3]
：
Reserved .
Bit 2
：
Select WDTO count mode.
0
－
Second
1
－
Minute
Bit [1
：
0]
：
select PLED mode
00 Power LED pin is tri-stated.
01 Power LED pin is droved low.
10 Power LED pin is a 1Hz toggle pulse with 50 duty cycle.
11 Power LED pin is a 1/4Hz toggle pulse with 50 duty cycle.
WDT_CRWV EQU 0F4H
Logical Device 8
CRF4 (Default 0x00)
Watch Dog Timer Time-out value.
Writing a non-zero value to this register causes the counter to load the value to Watch Dog Counter and
start counting down.
Reading this register returns current value in Watch Dog Counter instead of Watch Dog Timer
Time-out value.
Bit [7
：
0] = 0x00 Time-out Disable
= 0x01 Time-out occurs after 1 second/minute
= 0x02 Time-out occurs after 2 second/minutes
= 0x03 Time-out occurs after 3 second/minutes
.....................................................................................
= 0xFF Time-out occurs after 255 second/minutes
WDT_CRWE EQU 0F5H
Logical Device 8