Function Descriptions; Systick Calibration; Register Map; Table 25. Nvic Register Map - Holtek HT32F52243 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F52243/HT32F52253

Function Descriptions

SysTick Calibration

The SysTick Calibration Value Register (SCALIB) is provided by the NVIC to give a reference time
base of 1 ms for the RTOS tick timer or other purpose. The TENMS field in the SCALIB register has
a fixed value of 5000 which is the counter reload value to indicate 1 ms when the clock source comes
from the SysTick reference input clock STCLK with a frequency of 5 MHz (40 MHz divide by 8).

Register Map

The following table shows the NVIC registers and reset values.

Table 25. NVIC Register Map

Register
NVIC Base Address = 0xE000_E000
SYST_CSR
SYST_RVR
SYST_CVR
SYST_CALIB
NVIC_ISER
NVIC_ICER
NVIC_ISPR
NVIC_ICPR
NVIC_IPR0
NVIC_IPR1
NVIC_IPR2
NVIC_IPR3
NVIC_IPR4
NVIC_IPR5
NVIC_IPR6
NVIC_IPR7
CPUID
ICSR
VTOR
AIRCR
SCR
CCR
SHPR2
SHPR3
Note: For more information of the above detail register descriptions, please refer to the
"Cortex™-M0+ Devices Generic User Guide" document from Arm
Rev. 1.20
Offset
0x010 SysTick Control and Status Register
0x014 SysTick Reload Value Register
0x018 SysTick Current Value Register
0x01C SysTick Calibration Value Register
0x100 Interrupt Set Enable Register
0x180 Interrupt Clear Enable Register
0x200 Interrupt Set Pending Register
0x280 Interrupt Clear Pending Register
0x400 Interrupt 0 ~ 3 Priority Register
0x404 Interrupt 4 ~ 7 Priority Register
0x408 Interrupt 8 ~ 11 Priority Register
0x40C Interrupt 12 ~ 15 Priority Register
0x410 Interrupt 16 ~ 19 Priority Register
0x414 Interrupt 20 ~ 23 Priority Register
0x418 Interrupt 24 ~ 27 Priority Register
0x41C Interrupt 28 ~ 31 Priority Register
0xD00 CPUID register
0xD04 Interrupt Control and State Register
0xD08 Vector Table Offset Register
0xD0C Application Interrupt and Reset Control Register
0xD10 System Control Register
0xD14 Configuration and Control Register
0xD1C System Handlers Priority Register 2
0xD20 System Handlers Priority Register 3
162 of 501
Description
®
.
Reset Value
0x0000_0000
Unpredictable
Unpredictable
0x4000_1388
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0x410C_C601
0x0000_0000
0x0000_0000
0xFA05_0000
0x0000_0000
0x0000_0204
0x0000_0000
0x0000_0000
September 19, 2018