UPD30181 Datasheet, PDF (232/444 Pages) NEC – 64-/32-Bit Microprocessor

CHAPTER 12 DEADMAN’S SWITCH UNIT (DSU)
12.2.2 DSUSETREG (0x0B00 00E2)
Bit
Name
R/W
RTCRST
Other resets
15
Reserved
R
0
0
14
Reserved
R
0
0
13
Reserved
R
0
0
12
Reserved
R
0
0
11
Reserved
R
0
0
10
Reserved
R
0
0
9
Reserved
R
0
0
8
Reserved
R
0
0
Bit
Name
R/W
RTCRST
Other resets
7
Reserved
R
0
0
6
Reserved
R
0
0
5
Reserved
R
0
0
4
Reserved
R
0
0
3
2
1
0
DEDTIME3 DEDTIME2 DEDTIME1 DEDTIME0
R/W
R/W
R/W
R/W
0
0
0
1
0
0
0
1
Bit
15 to 4
3 to 0
Name
Reserved
DEDTIME(3:0)
0 is returned when read
Deadman’s Switch cycle setting
1111 : 15 seconds
1110 : 14 seconds
:
0010 : 2 seconds
0001 : 1 second
0000 : Setting prohibited
Function
This register is used to set the cycle for Deadman’s Switch function.
The Deadman’s Switch cycle can be set in 1-second units in a range from 1 to 15 seconds. The DSWCLR bit in
the DSUCLRREG register must be set by means of software within the cycle time specified in this register.
The VR4181’s operation is undefined when 0x0 has been set to DEDTIME(3:0).
232
User’s Manual U14272EJ3V0UM