UM10375 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
User manual Rev. 3 — 14 June 2011 297 of 368
NXP Semiconductors
UM10375
Chapter 17: LPC13xx System tick timer
17.6.4 System Timer Calibration value register (CALIB - 0xE000 E01C)
The value of the SYST_CALIB register is driven by the value of the SYSTCKCAL register
in the system configuration block (see Table 43
).
Table 287. System Timer Current value register (VAL - 0xE000 E018) bit description
Bit Symbol Description Reset
value
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 STCTRL.
0
31:24 - Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
Table 288. System Timer Calibration value register (CALIB - 0xE000 E01C) bit description
Bit Symbol Value Description Reset
value
23:0 TENMS Factory preset 0x4
29:24 - Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
30 SKEW Indicates whether the value of TENMS is precise. This
can affect the suitability of SysTick as a software real time
clock.
0
31 NOREF Indicates whether a separate reference clock is available.
This value is factory preset.
0
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