Register, 1 rsrr: watchdog timer control register, Register 4.1 rsrr: watchdog timer control register – FUJITSU MB91460 SERIES FR60 User Manual
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Chapter 20 Software Watchdog Timer
4.Register
4. Register
4.1 RSRR: Watchdog Timer Control Register
This register is used to set watchdog timer periods, and execute the startup control.
(This register also functions as the reset cause register that stores previously generated reset causes.)
Note: Refer also to “
• RSRR: Address 0480h (Access: Byte, Half-word)
(For the attributes, refer to “
Meaning of Bit Attribute Symbols (Page No.10)
”.)
The watchdog timer starts once it writes the watchdog timer control register.
• Bit7: Initialization reset occurred flag
Indicates whether a reset (INIT) was triggered by INIT pin input.
The initialization reset occurred flag (INIT) is cleared to “0” after reading.
• Bit6: Hardware Standby reset occurred flag
Indicates whether a reset (INIT) was triggered by HST pin input.
The hardware standby reset occurred flag (HSTB) is cleared to “0” after reading.
• Bit5: Watchdog reset occurred flag
Indicates whether a reset (INIT) was triggered by the watchdog timer.
The watchdog reset occurred flag (WDOG) is cleared to “0” after reading.
• Bit4: External reset occurred flag
Indicates whether a reset (RST) was triggered by the RST pin input.
The external reset occurred flag (ERST) is cleared to “0” after reading.
• Bit3: Software reset occurred flag
Indicates whether a software reset has been triggered by writing to the software reset bit (STCR.SRST).
7
6
5
4
3
2
1
0
bit
INIT
HSTB
WDOG
ERST
SRST
LINIT
WT1
WT0
1
0
0
0
0
0
0
0
Initial value
(INIT pin input)
-
-
-
X
X
-
0
0
Initial value (Watchdog reset)
X
X
X
-
-
X
0
0
Initial value (Software reset)
R/WX
R/WX
R/WX
R/WX
R/WX
R/WX
R/W
R/W
Attribute
INIT
Meaning
0
No INIT has been triggered by the INIT pin input.
1
INIT has been triggered by the INIT pin input.
HSTB
Meaning
0
No INIT has been triggered by the HST pin input.
1
INIT has been triggered by the HST pin input.
WDOG
Meaning
0
No INIT has been triggered by the watchdog timer.
1
INIT has been triggered by the watchdog timer.
ERST
Meaning
0
No RST has been triggered by the RST pin input.
1
RST has been triggered by the RST pin input.
SRST
Meaning
0
No RST has been triggered by a software reset.