Datasheet

LPC81XM All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4.3 — 22 April 2014 47 of 76
NXP Semiconductors
LPC81xM
32-bit ARM Cortex-M0+ microcontroller
12.3 Internal oscillators
[1] Parameters are valid over operating temperature range unless otherwise specified.
[2] Typical ratings are not guaranteed. The values listed are for room temperature (25 C), nominal supply
voltages.
[1] Typical ratings are not guaranteed. The values listed are at nominal supply voltages.
[2] The typical frequency spread over processing and temperature (T
amb
= 40 C to +105 C) is 40 %.
[3] See the LPC81xM user manual.
Table 13. Dynamic characteristics: IRC
T
amb
=  40  C to +105  C; 2.7 V  V
DD
 3.6 V
[1]
.
Symbol Parameter Conditions Min Typ
[2]
Max Unit
f
osc(RC)
internal RC oscillator
frequency
T
amb
= 40 C to
+105 C
11.82 12 12.18 MHz
Conditions: Frequency values are typical values. 12 MHz  1.5 % accuracy is guaranteed for
2.7 V  V
DD
 3.6 V and T
amb
= 40 C to +105 C. Variations between parts may cause the IRC to
fall outside the 12 MHz  1.5 % accuracy specification for voltages below 2.7 V.
Fig 29. Typical Internal RC oscillator frequency versus temperature
Table 14. Dynamic characteristics: Watchdog oscillator
Symbol Parameter Conditions Min Typ
[1]
Max Unit
f
osc(int)
internal oscillator
frequency
DIVSEL = 0x1F, FREQSEL = 0x1
in the WDTOSCCTRL register;
[2][3]
-9.4-kHz
DIVSEL = 0x00, FREQSEL = 0xF
in the WDTOSCCTRL register
[2][3]
- 2300 - kHz
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