Systick Current Value Register (Syst_Cvr); Systick Calibration Value Register (Syst_Calib) - Wiznet W7500 Reference Manual

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SysTick Current Value Register (SYST_CVR)

Address Offset : 0x018
Reset value : 0x0000_0000
31 30 29 28
res res res res
15 14 13 12
[23:0] CURRENT – Reads return the current value of the SysTick counter.
A write of any value clears the field to 0, and also clears the SYST_CSR.COUNTFLAG
bit to 0.

SysTick Calibration Value Register (SYST_CALIB)

Address Offset : 0x01C
Reset value : 0x0000_0000
31 30 29
NORF SKEW res
R R
15 14 13 12
[23:0] TENMS - Reads as zero. Indicates calibration value is not known.
[30] SKEW - Reads as one. Calibration value for the 10ms inexact timing is not known
because TENMS is not known. This can affect the suitability of SysTick as a software
real time clock.
[31] NOREF - Reads as one. Indicates that no separate reference clock is provided.
W7500x Reference Manual Version1.1.0
To generate a multi-short timer with a period of N processor clock cycles,
use a RELOAD value of N-1. For example, if the SysTick interrupt is
required every 100 clock pulses, set RELOAD to 99.
27 26 25
res res res
11 10 9
CURRENT [15:0]
28 27 26 25
res res res res
11 10 9
24 23 22 21
res
8 7 6 5
R/W
24 23 22 21
res
8 7 6 5
TENMS [15:0]
R
20 19 18
CURRENT[23:16]
R/W
4 3 2
20 19 18
TENMS[23:16]
R
4 3 2
35 / 399
17 16
1 0
17 16
1 0