Reset Control Unit (Rstcu); Introduction; Figure 16. Rstcu Block Diagram - Holtek HT32F52220 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F52220/HT32F52230
7

Reset Control Unit (RSTCU)

Introduction

The Reset Control Unit, RSTCU, has three kinds of reset, the power on reset, system reset and
APB unit reset. The power on reset, known as a cold reset, resets the full system during a power
up. A system reset resets the processor core and peripheral IP components with the exception of
the debug port controller. The resets can be triggered by an external signal, internal events and the
reset generators. More information about these resets will be described in the following section.
RSTCU
V
1.5 V Core POR15
DD15
Filter
Power POR
BODRST
Filter
Brown Out
V
DD
Detector
RESET
nRST Filter
WDT_RSTn
SYSRESETREQ
----
V
POR
V Domain
DD
DD Filter
POR
PWRST
Reset
WDTRST
Generator
Reset
USARTRST
Generator

Figure 16. RSTCU Block Diagram

Rev. 1.10
PORRESETn
SYSRESETREQ
Delay
SYSRESETn
PWRCU reset
WDT reset
PORRESETn
USART reset
98 of 366
®
Cortex -M0+
NVIC CM0+ Core
SYSRESETREQ
HRESETn CORERESTn
System Components
HRESETn
(BusMatrix, PMU)
System Debug
Components
November 09, 2018