Nested Vectored Interrupt Controller (Nvic); Introduction; Table 21. Exception Types - Holtek HT32F50231 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F50231/HT32F50241
10

Nested Vectored Interrupt Controller (NVIC)

Introduction

In order to reduce the latency and increase the interrupt processing efficiency, a tightly coupled
integrated section, which is named as Nested Vectored Interrupt Controller (NVIC) is provided
by the Cortex
®
which include functions such as the enable / disable control, priority, clear-pending, active status
report, software trigger and vector table remapping. Refer to the Technical Reference Manual of
Cortex -M0+ for more details.
®
Additionally, an integrated simple, 24-bit down count timer (SysTick) is provided by the
Cortex -M0+ to be used as a tick timer for the Real Timer Operation System (RTOS) or as a simple
®
counter. The SysTick counts down from the reloaded value and generates a system interrupt when it
reaches zero. The accompanying table lists the system exceptions types and a variety of peripheral
interrupts.

Table 21. Exception Types

Interrupt Exception Exception
Number Number
— 0
— 1 Reset
-14 2 NMI
-13 3 Hard Fault
— 4-10 Reserved
-5 11 SVCall
— 12-13 Reserved
-2 14 PendSV
-1 15 SysTick
0 16 LVD
1 17 RTC
2 18 FMC
3 19 WKUP
4 20 EXTI0 ~ 1
5 21 EXTI2 ~ 3
6 22 EXTI4 ~ 15
7 23 Reserved
8 24 ADC
9 25 Reserved
10 26 MCTM
11 27 Reserved
12 28 GPTM
13 29 Reserved
Rev. 1.00
-M0+. The NVIC controls the system exceptions and the peripheral interrupts
Priority
Type
— —
-3 (Highest)
-2
-1
—
Configurable (1)
—
Configurable (1)
Configurable
(1)
Configurable (2)
Configurable (2)
Configurable (2)
Configurable
(2)
Configurable (2)
Configurable (2)
Configurable (2)
—
Configurable (2)
—
Configurable (2)
—
Configurable
(2)
—
146 of 486
Vector
Description
Address
0x000 Initial Stack Point value
0x004 Reset
Non-Maskable Interrupt. The clock stuck
interrupt signal (clock monitor function
0x008
provided by Clock Control Unit) is
connected to the NMI input
0x00C All fault classes
—
0x02C SVC instruction System service call
—
0x038 System Service Pendable request
0x03C SysTick timer decremented to zero
0x040 Low voltage detection interrupt
0x044 RTC global interrupt
0x048 FMC global interrupt
EXTI event wakeup or external WAKEUP
0x04C
pin interrupt
0x050 EXTI Line 0 & 1 interrupt
0x054 EXTI Line 2 & 3 interrupt
0x058 EXTI Line 4 ~ 15 interrupt
0x05C
0x060 ADC global interrupt
0x064
0x068 MCTM global interrupt
0x06C
0x070 GPTM global interrupt
0x074
—
—
—
—
—
—
July 31, 2018