Datasheet

LPC12D27 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 1 — 20 September 2011 35 of 46
NXP Semiconductors
LPC12D27
32-bit ARM Cortex-M0 microcontroller
11.4 Internal oscillators
[1] Parameters are valid over operating temperature range unless otherwise specified.
[2] Typical ratings are not guaranteed. The values listed are at nominal supply voltages.
[1] Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply
voltages.
[2] The typical frequency spread over processing and temperature (T
amb
= 40 C to +85 C) is 40 %.
[3] See the LPC122x user manual.
Table 14. Dynamic characteristics: internal oscillators
T
amb
=  40  C to +85  C; V
DD(3V3)
over specified ranges.
[1]
Symbol Parameter Conditions Min Typ
[2]
Max Unit
f
osc(RC)
internal RC oscillator frequency - 11.88 12 12.12 MHz
Fig 21. Internal RC oscillator frequency versus temperature
Table 15. 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]
-7.8 - kHz
DIVSEL = 0x00, FREQSEL = 0xF
in the WDTOSCCTRL register
[2][3]
- 1700 - kHz
002aag020
11.95
12.05
12.15
f
osc(RC)
(MHz)
11.85
temperature (°C)
−40 853510 60−15
VDD = 3.6 V
3.3 V
3.0 V
12 MHz + 1%
12 MHz − 1%