LPC1786 datasheet(34/117 Pages) NXP

34 / 117 page

LPC178X_7X

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Objective data sheet

Rev. 2 — 27 May 2011

34 of 117

NXP Semiconductors

LPC178x/7x

32-bit ARM Cortex-M3 microcontroller

P5[3]

141

G14

G10

[11]

<tb

I/O

P5[3] — General purpose digital input/output pin.

R — Function reserved.

U4_RXD — Receiver input for USART4.

I/O

I2C0_SCL — I2C0 clock input/output (this pin uses a

specialized I2C pad that supports I2C Fast Mode Plus.

P5[4]

206

143

[3]

I/O

P5[4] — General purpose digital input/output pin.

U0_OE — RS-485/EIA-485 output enable signal for UART0.

R — Function reserved.

T3_MAT3 — Match output for Timer 3, channel 3.

U4_TXD — Transmitter output for USART4 (input/output in

smart card mode).

JTAG_TDO

(SWO)

2D3

[3]

JTAG_TDO (SWO) — Test Data Out for JTAG interface. Also

used as Serial wire trace output.

JTAG_TDI

[3]

JTAG_TDI — Test Data In for JTAG interface.

JTAG_TMS

(SWDIO)

6E3

[3]

JTAG_TMS (SWDIO) — Test Mode Select for JTAG interface.

Also used as Serial wire debug data input/output.

JTAG_TRST

8D1

[3]

JTAG_TRST — Test Reset for JTAG interface.

JTAG_TCK

(SWDCLK)

[3]

JTAG_TCK (SWDCLK) — Test Clock for JTAG interface. This

clock must be slower than 1 /6 of the CPU clock (CCLK) for the

JTAG interface to operate. Also used as serial wire clock.

RESET

[12]

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. This pin includes

a 20 ns input glitch filter.

RSTOUT

[3]

Reset status output. A LOW output on this pin indicates that the

device is in the reset state, for any reason. This reflects the

RESET input pin and all internal reset sources.

RTC_ALARM

[13]

RTC_ALARM — RTC controlled output. This is a 1.8 V pin. It

goes HIGH when a RTC alarm is generated.

RTCX1

[14]

[15]

Input to the RTC 32 kHz ultra-low power oscillator circuit.

RTCX2

[14]

[15]

Output from the RTC 32 kHz ultra-low power oscillator circuit.

USB_D

252

[9]

<tb

I/O

USB_D

2 — USB port 2 bidirectional D line.

VBAT

RTC power supply: 3.3 V on this pin supplies power to the

RTC.

Table 3.

Pin description …continued

Not all functions are available on all parts. See Table 2 (Ethernet, USB, LCD, QEI, SD/MMC, DAC pins) and Table 7 (EMC

pins).

Symbol

Description

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