at75c220 ATMEL Corporation, at75c220 Datasheet - Page 141

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

WD Overflow Mode Register
Name:
Access:
Reset Value:0
•
•
•
•
•
WDEN: Watchdog Enable
RSTEN: Reset Enable
IRQEN: Interrupt Enable
EXTEN: External Signal Enable
OKEY: Overflow Access Key
0 = Watchdog is disabled and does not generate any signals.
1 = Watchdog is enabled and generates enabled signals.
0 = Generation of an internal reset by the watchdog is disabled.
1 = When overflow occurs, the watchdog generates an internal reset.
0 = Generation of an interrupt by the watchdog is disabled.
1 = When overflow occurs, the watchdog generates an interrupt.
0 = Generation of a pulse on the pin NWDOVF by the watchdog is disabled.
1 = When an overflow occurs, a pulse on the pin NWDOVF is generated.
Used only when writing WD_OMR. OKEY is read as 0.
0x234 = Write access in WD_OMR is allowed.
Other value = Write access in WD_OMR is prohibited.
31
23
15
–
–
7
WD_OMR
Read/write
30
22
14
–
–
6
OKEY
29
21
13
–
–
5
28
20
12
–
–
4
OKEY
EXTEN
27
19
11
–
–
3
IRQEN
26
18
10
–
–
2
RSTEN
25
17
–
–
9
1
WDEN
24
16
–
–
8
0
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