LPC2458 NXP Semiconductors, LPC2458 Datasheet - Page 20

• Manufacturer Part Number: LPC2458
• Description: NXP Semiconductors designed the LPC2458 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 4.
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
[11] When the main oscillator is not used, connect XTAL1 and XTAL2 as follows: XTAL1 can be left floating or can be grounded (grounding
[12] If the RTC is not used, these pins can be left floating.
[13] Pad provides special analog functionality.
[14] Pad provides special analog functionality.
[15] Pad provides special analog functionality.
[16] Pad provides special analog functionality.
[17] Pad provides special analog functionality.
[18] Pad provides special analog functionality.
7. Functional description
LPC2458
Product data sheet
Symbol
V
VREF
VBAT
DDA
5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
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.
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.
Open-drain 5 V tolerant digital I/O pad, compatible with I
functionality. When power is switched off, this pin connected to the I
configuration applies to all functions on this pin.
Pad provides digital I/O and USB functions. It is designed in accordance with the USB specification, revision 2.0 (Full-speed and
Low-speed mode only).
5 V tolerant pad with 5 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.
Pad provides special analog functionality.
This pin has a built-in pull-up resistor.
This pin has no built-in pull-up and no built-in pull-down resistor.
is preferred to reduce susceptibility to noise). XTAL2 should be left floating.
Pin description
7.1 Architectural overview
Ball
F2
G2
K1
The LPC2458 microcontroller consists of an ARM7TDMI-S CPU with emulation support,
the ARM7 local bus for closely coupled, high-speed access to the majority of on-chip
memory, the AMBA AHB interfacing to high-speed on-chip peripherals and external
memory, and the AMBA APB for connection to other on-chip peripheral functions. The
microcontroller permanently configures the ARM7TDMI-S processor for little-endian byte
order.
The LPC2458 implements two AHB in order to allow the Ethernet block to operate without
interference caused by other system activity. The primary AHB, referred to as AHB1,
includes the VIC, GPDMA controller, and EMC.
[18]
[18]
[18]
…continued
Type
I
I
I
Description
analog 3.3 V pad supply voltage: This should be nominally the same voltage as
V
to power the ADC and DAC.
ADC reference: This should be nominally the same voltage as V
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.
All information provided in this document is subject to legal disclaimers.
DD(3V3)
Rev. 4 — 1 September 2011
but should be isolated to minimize noise and error. This voltage is used
2
C-bus 400 kHz specification. It requires an external pull-up to provide output
2
C-bus is floating and does not disturb the I
Single-chip 16-bit/32-bit micro
2
LPC2458
C lines. Open-drain
© NXP B.V. 2011. All rights reserved.
DD(3V3)
but
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