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W7500x Reference Manual Version1.1.0
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9.4
Registers (Base : 0xE000_E000)
System Timer control and status register (SYST_CSR)
Address Offset : 0x010
Reset value : 0x0000_0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
res
res
res
res
res
res
res
res
res
res
res
res
res
res
res
CNTFLAG
R
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
res
res
res
res
res
res
res
res
res
res
res
res
res
res
TICKINT
ENABLE
R/W
R/W
[0] ENABLE – Enables the counter
0 : Counter disabled
1 : Counter enabled
[1] TICKINT – Enables SysTick exception request
O : Counting down to zero does not assert the SysTick exception request
1 : Counting down to zero to asserts the SysTick exception request
[16] COUNTFLAG – Returns 1 if timer counted to 0 since the last read of this register.
SysTick Reload Value Register (SYST_RVR)
Address Offset : 0x014
Reset value : 0x0000_0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
res
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res
res
RELOAD[23:16]
R
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RELOAD[15:0]
R
[23:0] RELOAD – Value to load into the SYST_CVR when the counter is enabled and
when it reaches 0
-
The RELOAD value can be any value in the range 0x0000_0001 –
0x00FFFFFF. You can program a value of 0, but this has no effect because
the SysTick exception request and COUNTFLAG are activated when count
from 1 to 0.