upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 692

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

17.2.3 NP flag
The NP flag is a status flag that indicates that non-maskable interrupt servicing is under execution.
This flag is set when a non-maskable interrupt request has been acknowledged, and masks non-mask-
able interrupt requests to prohibit multiple interrupts from being acknowledged.
17.2.4 Eliminating noise on NMI pin
The NMI pin has a noise eliminator that eliminates noise using analog delay. Unless the level input to
the NMI pin is held for a specific time, therefore, it cannot be detected as an edge i.e., the edge is
detected after specific time.
The NMI pin is used to release the software STOP mode. Because the internal system clock is stopped
in the software STOP mode, digital noise elimination (over-sampling) by the system clock is not imple-
mented.
692
PSW
After reset: 00000020H
31
NP
0
1
Chapter 17 Interrupt/Exception Processing Function
Figure 17-4: NP Flag Format
0
User’s Manual U16702EE3V2UD00
Non-maskable interrupt currently being serviced
Non-maskable interrupt servicing status
No non-maskable interrupt servicing
8
NP EP
7
6
ID
5
SAT CY OV
4
3
2
S
1
Z
0