SN32F280 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 41
Version 1.1
2.2.3.3
System Tick Timer Current Value register (SYSTICK_VAL)
Address: 0xE000 E018 (Refer to Cortex-M0 Spec)
Bit
Name
Description
Attribute
Reset
31:24
Reserved
R
0
23:0
CURRENT
Reading this register returns the current value of the System Tick counter.
Writing any value clears the System Tick counter and the COUNTFLAG bit
in SYSTICK_CTRL.
R/W
0x7E7F35
2.2.3.4
System Tick Timer Calibration Value register (SYSTICK_CALIB)
Address: 0xE000 E01C (Refer to Cortex-M0 Spec)
Bit
Name
Description
Attribute
Reset
31
NOREF
Indicates the reference clock to M0 is provided or not.
1: No reference clock provided.
R
1
30
SKEW
Indicates whether the TENMS value is exact, an inexact TENMS value can
affect the suitability of SysTick as a software real time clock.
0: TENMS value is exact
1: TENMS value is inexact, or not given.
R
0
29:24
Reserved
R
0
23:0
TENMS
Reload value for 10ms timing, subject to system clock skew errors. If the
value reads as zero, the calibration value is not known.
R/W
0xA71FF
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