Nested Vectored Interrupt Controller (Nvic); Introduction; Table 25. Exception Types - Holtek HT32F54231 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F54231/HT32F54241/HT32F54243/HT32F54253
10 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-Time Operating 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 25. Exception Types

Interrupt 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 CMP0 ~ 1
8 24 ADC
9 25 I 2 C2
10 26 MCTM
Rev. 1.00
-M0+. The NVIC controls the system exceptions and the peripheral interrupts
Exception
Priority
Type
— —
-3 (Highest)
-2
-1
—
Configurable
—
Configurable
Configurable
Configurable
Configurable
Configurable
Configurable
Configurable
Configurable
Configurable
Configurable
(4)
Configurable
(4) Configurable
Configurable
175 of 576
Vector
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
—
(1) 0x02C SVC instruction System service call
—
(1) 0x038 System Service Pendable request
0x03C SysTick timer decreased to zero
(1)
(2) 0x040 Low voltage detection interrupt
(2) 0x044 RTC global interrupt
(2) 0x048 FMC global interrupt
EXTI event wakeup or external
0x04C
(2)
WAKEUP-pin interrupt
(2) 0x050 EXTI Line 0 & 1 interrupt
0x054 EXTI Line 2 & 3 interrupt
(2)
(2) 0x058 EXTI Line 4 ~ 15 interrupt
0x05C Comparators global interrupt
(2)
(2) 0x060 ADC global interrupt
(2) 0x064 I 2 C2 global interrupt
0x068 MCTM global interrupt
(2)
Description
—
—
(3)
January 28, 2022