LPC2104_2105_2106_7
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 07 — 20 June 2008
9 of 41
NXP Semiconductors
LPC2104/2105/2106
Single-chip 32-bit microcontrollers
[1]
5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.
[2]
Open-drain 5 V tolerant digital I/O pad, compatible with I2C-bus 400 kHz specication. It requires external pull-up to provide an output
functionality. Open-drain conguration applies to all functions on this pin.
[3]
SSP interface available on LPC2104/2105/2106/01 only.
[4]
5 V tolerant pad with built-in pull-up resistor providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.
The pull-up resistor’s value ranges from 60 k
to 300 k.
[5]
5 V tolerant pad providing digital input (with TTL levels and hysteresis) function only.
P0.26/TRACESYNC
I/O
P0.26 — Port 0 bit 26.
O
TRACESYNC — Trace Synchronization Standard I/O port with internal pull-up.
P0.27/TRACEPKT0/
TRST
I/O
P0.27 — Port 0 bit 27.
O
TRACEPKT0 — Trace Packet, bit 0. Standard I/O port with internal pull-up.
I
TRST — Test Reset for JTAG interface, secondary JTAG pin group.
P0.28/TRACEPKT1/
TMS
I/O
P0.28 — Port 0 bit 28.
O
TRACEPKT1 — Trace Packet, bit 1. Standard I/O port with internal pull-up.
I
TMS — Test Mode Select for JTAG interface, secondary JTAG pin group.
P0.29/TRACEPKT2/
TCK
I/O
P0.29 — Port 0 bit 29.
O
TRACEPKT2 — Trace Packet, bit 2. Standard I/O port with internal pull-up.
I
TCK — Test Clock for JTAG interface, secondary JTAG pin group. This clock
must be slower than 1/6 of the CPU clock (CCLK) for the JTAG interface to
operate.
P0.30/TRACEPKT3/
TDI
I/O
P0.30 — Port 0 bit 30.
O
TRACEPKT3 — Trace Packet, bit 3. Standard I/O port with internal pull-up.
I
TDI — Test Data In for JTAG interface, secondary JTAG pin group.
P0.31/EXTIN0/TDO
I/O
P0.31 — Port 0 bit 31.
I
EXTIN0 — External Trigger Input. Standard I/O port with internal pull-up.
O
TDO — Test Data out for JTAG interface, secondary JTAG pin group.
RTCK
I/O
Returned Test Clock output: Extra signal added to the JTAG port. Assists
debugger synchronization when processor frequency varies. Also used during
debug mode entry to select primary or secondary JTAG pins with the 48-pin
package. Bidirectional pin with internal pull-up.
DBGSEL
27
I
Debug Select: When LOW, the part operates normally. When HIGH, debug
mode is entered. Input pin with internal pull-down.
RESET
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
11
I
input to the oscillator circuit and internal clock generator circuits.
XTAL2
12
O
output from the oscillator amplier.
VSS
7, 19,
31, 43
I
ground: 0 V reference.
VDD(1V8)
5
I
1.8 V core power supply; this is the power supply voltage for internal circuitry.
VDD(3V3)
17, 40
I
3.3 V pad power supply; this is the power supply voltage for the I/O ports.
n.c.
4, 20,
25, 42
-
not connected; these pins are not connected in the 48-pin package.
Table 3.
Pin description …continued
Symbol
Pin
Type
Description