Nested Vectored Interrupt Controller (Nvic); Introduction; Table 26. Exception Types - Holtek HT32F12345 User Manual

32-Bit Arm ® Cortex ® -M3 MCU
HT32F12345
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 ® -M3 for more details.
Additionally, an integrated simple, 24-bit down count timer (SysTick) is provided by the
Cortex -M3 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 reached zero.
The accompanying table lists the 16 system exceptions types and a variety of peripheral interrupts.

Table 26. Exception types

Exception
Priority
Type
— —
Reset -3 (Highest)
NMI -2
Hard Fault -1
Memory
Configurable
Management
Bus Fault Configurable
Usage Fault Configurable
— —
— —
— —
— —
SVCCall Configurable
Debug Monitor Configurable
— Configurable
PendSV Configurable
SySTick Configurable
CKRDY Configurable
LVD Configurable
BOD Configurable
Rev. 1.10
-M3. The NVIC controls the system exceptions and the peripheral interrupt
Interrupt Exception
Number Number
— 0
— 1
— 2
— 3
(1) — 4
(1) — 5
— 6
(1)
— 7
— 8
— 9
— 10
(1) — 11
(1) — 12
(1) — 13
(1) — 14
(1) — 15
(2) 0 16
(2) 1 17
(2) 2 18
166 of 590
Vector
Description
Address
0x000 Initial Stack Point value
0x004 Reset
Non-Maskable Interrupt. The clock
stuck interrupt signal (clock monitor
0x008
function provided by Clock Control Unit)
is connected to the NMI input
0x00C All fault classes
M e m o r y P r o t e c t i o n U n i t ( M P U )
0x010 mismatch, including access violation
and no match
Pre-fetch fault, memory access fault,
0x014
and other address / memory related
U s a g e f a u l t , s u c h a s u n d e f i n e d
0x018 executed instruction or illegal attempt of
state transition
0x01C Reserved
0x020 Reserved
0x024 Reserved
0x028 Reserved
0x02C SVC instruction System service call
0x030 Debug monitor, when not halted
0x034 Reserved
0x038 System Service Pendable request
0x03C SysTick timer decremented to zero
Clock ready interrupt
0x040
(HSE, HSI, LSE, LSI or PLL)
0x044 Low voltage detection interrupt
0x048 Brown-out detection interrupt
November 28, 2018