Table of Contents
Advertisement
Philips Semiconductors
ARM-based Microcontroller
Table 13: Recommended values for C
Fundamental Oscillation
Frequency F
5 - 10 MHz
10 - 15 MHz
15 - 20 MHz
20 - 25 MHz
25 - 30 MHz
min f
= 10 MHz
OSC
max f
= 25 MHz
OSC
(
Figure 12, mode a and/or b)
System Control Block
in oscillation mode (crystal and external components parameters)
X1/X2
Crystal Load
Capacitance C
C
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
True
True
max f
Figure 13: F
Max. Crystal Series
Resistence R
L
< 300 :
< 300 :
< 300 :
< 300 :
< 220 :
< 140 :
< 220 :
< 140 :
< 80 :
< 160 :
< 90 :
< 50 :
<130 :
<50 :
n.a.
f
selection
OSC
on-chip PLL used
in application?
False
ISP used for initial
code download?
False
external crystal
oscillator used?
False
min f
= 1 MHz
OSC
= 50 MHz
OSC
(Figure 12, mode a)
selection algorithm
OSC
68
Preliminary User Manual
LPC2119/2129/2194/2292/2294
External Load
Capacitors C
S
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
n.a.
True
min f
= 1 MHz
OSC
max f
= 30 MHz
OSC
(Figure 12, mode b)
, C
X1
X2
May 03, 2004
Advertisement
Table of Contents
