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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 “Chapter 9 Reset (Page No.139)”.
• 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).
76543210 bit
INIT HSTB WDOG ERST SRST LINIT WT1 WT0
10000000
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.