SN32F100 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 53
Version 1.9
3:0
AHBPRE[3:0]
AHB clock source prescale value
0000: SYSCLK / 1
0001: SYSCLK / 2
0010: SYSCLK / 4
0011: SYSCLK / 8
0100: SYSCLK / 16
0101: SYSCLK / 32
0110: SYSCLK / 64
0111: SYSCLK / 128
1000: SYSCLK / 256
1001: SYSCLK / 512
Other: Reserved
R/W
0
3.3.6 System Reset Status register (SYS0_RSTST)
Address Offset: 0x14
This register contains the reset source except DPDWAKEUP reset, since the LPFLAG bit in PMU_CTRL register had
presented this case.
Bit
Name
Description
Attribute
Reset
31:5
Reserved
R
0
4
PORRSTF
POR reset flag
Set by HW when a POR reset occurs.
0: Read
No POR reset occurred
Write
Clear this bit
1: POR reset occurred.
R/W
1
3
EXTRSTF
External reset flag
Set by HW when a reset from the RESET pin occurs.
0: Read
No reset from RESET pin occurred
Write
Clear this bit
1: Reset from RESET pin occurred.
R/W
0
2
LVDRSTF
LVD reset flag
Set by HW when a LVD reset occurs.
0: Read
No LVD reset occurred
Write
Clear this bit
1: LVD reset occurred.
R/W
0
1
WDTRSTF
WDT reset flag
Set by HW when a WDT reset occurs.
0: Read
No watchdog reset occurred
Write
Clear this bit
1: Watchdog reset occurred.
R/W
0
0
SWRSTF
Software reset flag
Set by HW when a software reset occurs.
0: Read
No software reset occurred
Write
Clear this bit
1: Software reset occurred.
R/W
1
3.3.7 LVD Control register (SYS0_LVDCTRL)
Address Offset: 0x18
The LVD control register selects four separate threshold values for generating a LVD interrupt to the NVIC or LVD
reset.
Bit
Name
Description
Attribute
Reset
31:16
Reserved
R
0
15
LVDEN
LVD enable
0: Disable
1: Enable
R/W
0
14
LVDRSTEN
LVD Reset enable
0: Disable
1: Enable
R/W
0
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