Datasheet
LPC122X All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 26 August 2011 14 of 61
NXP Semiconductors
LPC122x
32-bit ARM Cortex-M0 microcontroller
[1] Pin state at reset for default function: I = Input; O = Output; PU = internal pull-up enabled; IA = inactive, no pull-up/down enabled.
[2] 3.3 V tolerant, digital I/O pin; default: pull-up enabled, no hysteresis.
[3] If set to output, this normal-drive pin is in low mode by default.
[4] I
2
C-bus pins; 5 V tolerant; open-drain; default: no pull-up/pull-down; no hysteresis.
[5] 3.3 V tolerant, digital I/O pin with RESET
function; default: pull-up enabled, no hysteresis. An external pull-up resistor is required on this
pin for the Deep power-down mode.
[6] 3.3 V tolerant, digital I/O pin with analog function; default: pull-up enabled, no hysteresis.
[7] If set to output, this normal-drive pin is in high mode by default.
[8] 3.3 V tolerant, digital I/O pin with analog function and WAKEUP function; default: pull-up enabled, no hysteresis.
[9] 3.3 V tolerant, high-drive digital I/O pin; default: pull-up enabled, no hysteresis.
[10] If the RTC is not used, RTCXIN and RTCXOUT can be left floating.
To enable a peripheral function, find the corresponding port pin, or select a port pin if the
function is multiplexed, and program the port pin’s IOCONFIG register to enable that
function. The primary SWD functions and RESET
are the default functions on their pins
after reset.
V
DD(IO)
47 63 - I - Input/output supply voltage.
V
DD(3V3)
44 56 - I - 3.3 V supply voltage to the internal regulator and the ADC. Also
used as the ADC reference voltage.
V
SSIO
48 64 - I - Ground.
V
SS
43 55 - I - Ground.
Table 3. LPC122x pin description
…continued
Symbol
Pin LQFP48
Pin LQFP64
Start
logic
input
Type Reset
state
[1]
Description
Table 4. Pin multiplexing
Peripheral Function Type Available on ports:
Analog comparators ROSC I/O PIO0_29 - -
ACMP0_I0 I PIO0_19 - -
ACMP0_I1 I PIO0_20 - -
ACMP0_I2 I PIO0_21 - -
ACMP0_I3 I PIO0_22 - -
ACMP0_O O PIO0_27 - -
ACMP1_I0 I PIO0_23 - -
ACMP1_I1 I PIO0_24 - -
ACMP1_I2 I PIO0_25 - -
ACMP1_I3 I PIO0_26 - -
ACMP1_O O PIO0_28 - -