LPC2458 Datasheet, PDF (19/67 Pages) NXP Semiconductors – Single-chip 16-bit/32-bit micro; 512 kB flash, Ethernet, CAN, ISP/IAP, USB 2.0 device/host/OTG, external memory interface

NXP Semiconductors
LPC2458
Single-chip 16-bit/32-bit microcontroller
Table 4.
Symbol
TRST
TCK
Pin description …continued
Ball
Type
D4^[1]
I
D2^[1]
I
RTCK
C4^[1]
I/O
RSTOUT
RESET
XTAL1
XTAL2
RTCX1
RTCX2
V_SSIO
V_SSCORE
V_SSA
V_DD(3V3)
n.c.
V_{DD(DCDC)(3V3)}
V_DDA
VREF
VBAT
H2
O
J1^[7]
I
L2^[8]
I
K4^[8]
O
J2^[8]
I
J3^[8]
O
H4, P4, I
L9, L13,
G13,
D13,
C11,
B4^[9]
H3, L8, I
A10^[9]
F3^[10]
I
E2, L4, I
K8, L11,
J14, E12,
E10,
C5^[11]
H1, L12, I
G10^[12]
G1, N9, I
E9^[13]
F2^[14]
I
G2^[14]
I
K1^[14]
I
Description
TRST — Test Reset for JTAG interface.
TCK — Test Clock for JTAG interface. This clock must be slower than ¹â„₆ of the
CPU clock (CCLK) for the JTAG interface to operate.
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 — This is a 3.3 V pin. LOW on this pin indicates LPC2458 being in
Reset state.
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.
Input to the oscillator circuit and internal clock generator circuits.
Output from the oscillator amplifier.
Input to the RTC oscillator circuit.
Output from the RTC oscillator circuit.
ground: 0 V reference for the digital IO pins.
ground: 0 V reference for the core.
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.
3.3 V supply voltage: This is the power supply voltage for the I/O ports.
not connected pins: These pins must be left unconnected (floating).
3.3 V DC-to-DC converter supply voltage: This is the power supply for the
on-chip DC-to-DC converter.
analog 3.3 V pad supply voltage: This should be nominally the same voltage as
V_DD(3V3) but should be isolated to minimize noise and error. This voltage is used
to power the ADC and DAC.
ADC reference: This should be nominally the same voltage as V_DD(3V3) but
should be isolated to minimize noise and error. The level on this pin is used as a
reference for ADC and DAC.
RTC power supply: 3.3 V on this pin supplies the power to the RTC peripheral.
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
[2] 5 V tolerant pad providing digital I/O functions (with TTL levels and hysteresis) and analog input. When configured as a ADC input,
digital section of the pad is disabled.
[3] 5 V tolerant pad providing digital I/O with TTL levels and hysteresis and analog output function. When configured as the DAC output,
digital section of the pad is disabled.
LPC2458_2
Product data sheet
Rev. 02 — 25 November 2008
© NXP B.V. 2008. All rights reserved.
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