R01UH0823EJ0100 Rev.1.00
Page 280 of 1823
Jul 31, 2019
RX23W Group
15. Interrupt Controller (ICUb)
15.2.11
Non-Maskable Interrupt Status Register (NMISR)
The NMISR register monitors the status of a non-maskable interrupt source. Writing to the NMISR register is ignored.
The setting in the non-maskable interrupt enable register (NMIER) does not affect the status flags in NMISR.
Before the end of the non-maskable interrupt handler, read the NMISR register and confirm the generation status of other
non-maskable interrupts. Be sure to confirm that all of the bits in the NMISR register are set to 0 before the end of the
handler.
NMIST Flag (NMI Status Flag)
This flag indicates the NMI pin interrupt request.
The NMIST flag is read-only, and cleared by the NMICLR.NMICLR bit.
[Setting condition]
When an edge specified by the NMICR.NMIMD bit is input to the NMI pin
[Clearing condition]
When 1 is written to the NMICLR.NMICLR bit
OSTST Flag (Oscillation Stop Detection Interrupt Status Flag)
This flag indicates the oscillation stop detection interrupt request.
The OSTST flag is read-only, and cleared by the NMICLR.OSTCLR bit.
[Setting condition]
When the oscillation stop detection interrupt is generated
[Clearing condition]
When 1 is written to the NMICLR.OSTCLR bit
Address(es): ICU.NMISR 0008 7580h
b7
b6
b5
b4
b3
b2
b1
b0
—
VBATS
T
—
LVD1S
T
IWDTS
T
WDTST OSTST NMIST
Value after reset:
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b0
NMI Status Flag
0: NMI pin interrupt is not requested
1: NMI pin interrupt is requested
R
b1
Oscillation Stop Detection
Interrupt Status Flag
0: Oscillation stop detection interrupt is not requested
1: Oscillation stop detection interrupt is requested
R
b2
WDT Underflow/Refresh
Error Status Flag
0: WDT underflow/refresh error interrupt is not requested
1: WDT underflow/refresh error interrupt is requested
R
b3
IWDT Underflow/Refresh
Error Status Flag
0: IWDT underflow/refresh error interrupt is not requested
1: IWDT underflow/refresh error interrupt is requested
R
b4
Voltage Monitoring 1
Interrupt Status Flag
0: Voltage monitoring 1 interrupt is not requested
1: Voltage monitoring 1 interrupt is requested
R
b5
—
Reserved
This bit is read as 0. Writing to this bit has no effect.
R
b6
VBATT Voltage Monitoring
Interrupt Status Flag
0: VBATT voltage monitoring interrupt request is not requested
1: VBATT voltage monitoring interrupt request is requested
R
b7
—
Reserved
This bit is read as 0. Writing to this bit has no effect.
R