Datasheet

195
11011B–ATARM–21-Feb-12
SAM3N
10.22.4 SysTick Calibration Value Register
The CALIB register indicates the SysTick calibration properties. See the register summary in
Table 10-33 on page 191 for its attributes. The bit assignments are:
•NOREF
Reads as zero.
•SKEW
Reads as zero
•TENMS
Read as 0x0002904. The SysTick calibration value is fixed at 0x0002904 (10500), which allows the generation of a time
base of 1 ms with SysTick clock at 6 MHz (48/8 = 6 MHz)
10.22.5 SysTick design hints and tips
The SysTick counter runs on the processor clock. If this clock signal is stopped for low power
mode, the SysTick counter stops.
Ensure software uses aligned word accesses to access the SysTick registers.
31 30 29 28 27 26 25 24
NOREF SKEW Reserved
23 22 21 20 19 18 17 16
TENMS
15 14 13 12 11 10 9 8
TENMS
76543210
TENMS