Datasheet
LPC2458 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4.1 — 15 October 2013 19 of 81
NXP Semiconductors
LPC2458
Single-chip 16-bit/32-bit micro
P4[31]/CS1 E7
[1]
I/O P4[31] — General purpose digital input/output pin.
O CS1
— LOW active Chip Select 1 signal.
ALARM H5
[7]
O ALARM — RTC controlled output. This is a 1.8 V pin. It goes HIGH when a RTC
alarm is generated.
USB_D2N2I/OUSB_D2 — USB port 2 bidirectional D line.
DBGEN E5
[1][8]
I DBGEN — JTAG interface control signal. Also used for boundary scan.
TDO B1
[1][9]
O TDO — Test Data Out for JTAG interface.
TDI C3
[1][8]
I TDI — Test Data In for JTAG interface.
TMS C2
[1][8]
I TMS — Test Mode Select for JTAG interface.
TRST
D4
[1][8]
I TRST — Test Reset for JTAG interface.
TCK D2
[1][9]
I TCK — Test Clock for JTAG interface. This clock must be slower than
1
⁄
6
of the
CPU clock (CCLK) for the JTAG interface to operate.
RTCK C4
[1][8]
I/O RTCK — JTAG interface control signal.
Note: LOW on this pin while RESET
is LOW enables ETM pins (P2[9:0]) to
operate as Trace port after reset.
RSTOUT
H2 O RSTOUT — This is a 3.3 V pin. LOW on this pin indicates LPC2458 being in
Reset state.
RESET
J1
[10]
I external reset input: A LOW on this pin resets the device, causing I/O ports and
peripherals to take on their default states, and processor execution to begin at
address 0. TTL with hysteresis, 5 V tolerant.
XTAL1 L2
[7][11]
I Input to the oscillator circuit and internal clock generator circuits.
XTAL2 K4
[7][11]
O Output from the oscillator amplifier.
RTCX1 J2
[7][12]
I Input to the RTC oscillator circuit.
RTCX2 J3
[7][12]
O Output from the RTC oscillator circuit.
V
SSIO
H4, P4,
L9, L13,
G13,
D13,
C11,
B4
[13]
I ground: 0 V reference for the digital IO pins.
V
SSCORE
H3, L8,
A10
[13]
I ground: 0 V reference for the core.
V
SSA
F3
[14]
I analog ground: 0 V reference. This should nominally be the same voltage as
V
SSIO
/V
SSCORE
, but should be isolated to minimize noise and error.
V
DD(3V3)
E2, L4,
K8, L11,
J14, E12,
E10,
C5
[15]
I 3.3 V supply voltage: This is the power supply voltage for the I/O ports.
n.c. H1, L12,
G10
[16]
I not connected pins: These pins must be left unconnected (floating).
V
DD(DCDC)(3V3)
G1, N9,
E9
[17]
I 3.3 V DC-to-DC converter supply voltage: This is the power supply for the
on-chip DC-to-DC converter.
Table 4. Pin description …continued
Symbol Ball Type Description