Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
261
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
12.10.1.2 SysTick Reload Value Registers
Name:
SYST_RVR
Access: Read/Write
Reset: 0x000000000
The SYST_RVR specifies the start value to load into the SYST_CVR.
RELOAD: SYST_CVR Load Value
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 0x00000001–0x00FFFFFF. A start value of 0 is possible, but has no
effect because the SysTick exception request and COUNTFLAG are activated when counting from 1 to 0.
effect because the SysTick exception request and COUNTFLAG are activated when counting from 1 to 0.
The RELOAD value is calculated according to its use: For example, to generate a multi-shot timer with a period of N pro-
cessor clock cycles, use a RELOAD value of N-1. If the SysTick interrupt is required every 100 clock pulses, set RELOAD
to 99.
cessor clock cycles, use a RELOAD value of N-1. If the SysTick interrupt is required every 100 clock pulses, set RELOAD
to 99.
31
30
29
28
27
26
25
24
–
23
22
21
20
19
18
17
16
RELOAD
15
14
13
12
11
10
9
8
RELOAD
7
6
5
4
3
2
1
0
RELOAD