UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 508 of 841
NXP Semiconductors
UM10360
Chapter 23: LPC176x/5x System Tick Timer
Table 442. System Timer Calibration value register (STCALIB - 0xE000 E01C) bit description
Bit Symbol Value Description Reset value
23:0 TENMS Reload value to get a 10 millisecond System Tick underflow rate when running
at 100 MHz. This value initialized at reset with a factory supplied value selected
for the LPC176x/5x. The provided values of TENMS, SKEW, and NOREF are
applicable only when using a CPU clock or external STCLK source of 100 MHz.
0x0F 423F
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 TENMS value will generate a precise 10 millisecond time,
or an approximation. This bit is initialized at reset with a factory supplied value
selected for the LPC176x/5x. See the description of TENMS above.
When 0, the value of TENMS is considered to be precise. When 1, the value of
TENMS is not considered to be precise.
0
31 NOREF Indicates whether an external reference clock is available. This bit is initialized
at reset with a factory supplied value selected for the LPC176x/5x. See the
description of TENMS above.
When 0, a separate reference clock is available. When 1, a separate reference
clock is not available.
0
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