External Interrupt Inputs - Philips LPC2101 User Manual

Philips Semiconductors
Volume 1
Table 7:
Fundamental
oscillation frequency
F
15 MHz - 20 MHz
20 MHz - 25 MHz
25 MHz - 30 MHz

3.5 External interrupt inputs

The LPC2101/02/03 includes up to three External Interrupt Inputs as selectable pin
functions. When the pins are combined, external events can be processed as three
independent interrupt signals. The External Interrupt Inputs can optionally be used to
wake up the processor from Power-down mode.
Additionally, all 10 capture inputs can also be used as external interrupts without the
option to wake up the device from Power-down mode.
User manual
Recommended values for C
components parameters)
Crystal load
capacitance C
OSC
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
true
true
MIN f = 10 MHz
OSC
MAX f = 25 MHz
OSC
mode a and/or b
Fig 7. F selection algorithm
OSC
Rev. 01 — 12 January 2006
Chapter 3: System control block
in oscillation mode (crystal and external
X1/X2
Maximum crystal
series resistance R
L
< 220 Ω
< 140 Ω
< 80 Ω
< 160 Ω
< 90 Ω
< 50 Ω
< 130 Ω
< 50 Ω
NA
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
MAX f = 50 MHz
OSC
mode a
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
UM10161
External load
capacitors C ,
S X1 CX2
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
NA
true
MIN f = 1 MHz
OSC
MAX f = 30 MHz
OSC
mode b
18