LPC2131 Philips Semiconductors (Acquired by NXP), LPC2131 Datasheet - Page 8

• Manufacturer Part Number: LPC2131
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
Table 3:
9397 750 14008
Preliminary data sheet
Symbol
P1.23/
PIPESTAT2
P1.24/
TRACECLK
P1.25/EXTIN0
P1.26/RTCK
P1.27/TDO
P1.28/TDI
P1.29/TCK
P1.30/TMS
P1.31/TRST
RESET
XTAL1
XTAL2
RTXC1
RTXC2
V
V
V
V
V
V
SS
SSA
DD
DDA
REF
BAT
Pin description
Pin
36
32
28
24
64
60
56
52
20
57
62
61
3
5
6, 18, 25, 42,
50
59
23, 43, 51
7
63
49
…continued
Type
O
O
I/O
I
I
I
I
I
I
I
O
I
I
I
I
I
I
O
I
O
Description
PIPESTAT2 — Pipeline Status, bit 2. Standard I/O port with internal pull-up.
TRACECLK — Trace Clock. Standard I/O port with internal pull-up.
EXTIN0 — External Trigger Input. Standard I/O with internal pull-up.
RTCK — Returned Test Clock output. Extra signal added to the JTAG port.
Assists debugger synchronization when processor frequency varies.
Bi-directional pin with internal pull-up. LOW on RTCK while RESET is LOW
enables pins P1.31:26 to operate as Debug port after reset.
TDO — Test Data out for JTAG interface.
TDI — Test Data in for JTAG interface.
TCK — Test Clock for JTAG interface.
TMS — Test Mode Select for JTAG interface.
TRST — Test Reset for JTAG interface.
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.
Analog ground: 0 V reference. This should nominally be the same voltage
as V
3.3 V power supply: This is the power supply voltage for the core and I/O
ports.
Analog 3.3 V power supply: This should be nominally the same voltage as
V
to power the on-chip PLL.
A/D converter reference: This should be nominally the same voltage as V
but should be isolated to minimize noise and error. Level on this pin is used as
a reference for A/D convertor.
RTC power supply: 3.3 V on this pin supplies the power to the RTC.
DD
Rev. 01 — 18 November 2004
SS
but should be isolated to minimize noise and error. This voltage is used
, but should be isolated to minimize noise and error.
LPC2131/2132/2138
Single-chip 16/32-bit microcontrollers
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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DD