Table of Contents
4. Registers
4.1 RSRR: Reset Cause Register
Stores the cause of the previous reset, and sets the period and activation control for the watchdog timer.
• RSRR: Address 0480h (Access: Byte, Half-word)
7
6
INIT
HSTB
1
0
-
-
X
X
R/WX
R/WX
Note: See
"Meaning of Bit Attribute Symbols (Page
Reading the reset request cause returns the reset cause flags and then clears the flag values to "0".
If multiple resets occur prior to reading the register, the resulting flag values contain the bitwise OR of the flags
for each reset. That is, more than one flag may be set to "1".
• Bit7: Initialization reset occurred flag
Indicates whether a reset (INIT) was triggered by INIT pin input.
INIT
0
No INIT has been triggered by the INIT pin input.
1
INIT has been triggered by the 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.
HSTB
0
No INIT has been triggered by the HST pin input.
1
INIT has been triggered by the 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.
WDOG
0
No INIT has been triggered by the watchdog timer.
1
INIT has been 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.
ERST
0
No RST has been triggered by the RST pin input.
1
RST has been triggered by the RST pin input.
The external reset occurred flag (ERST) is cleared to "0" after reading.
• Bit3: Software reset occurred flag
5
4
3
WDOG
ERST
SRST
0
0
0
-
X
X
X
-
-
R/WX
R/WX
R/WX
2
1
0
LINIT
WT1
WT0
0
0
0
-
0
0
X
0
0
R/WX
R/W
R/W
No.10)" for details of the attributes.
Meaning
Meaning
Meaning
Meaning
Chapter 9 Reset
4.Registers
bit
Initial value
(INIT pin input)
Initial value
(Watchdog reset)
Initial value
(Software reset)
Attribute
141
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