NXP Semiconductors LPC2919 Functional description, Reset, debug, test and power description

NXP Semiconductors

Table 3.	LQFP144 pin assignment …continued
Symbol	Pin	Description

DRAFT	D	D		AFT
	RAFT	RAFT AFT
			DR	DR

DLPC2917/19
ARM9 microcontrollerRAFT	withDRAFTCANDRAFTand LINDRAFT
	T DRAFT	T
DRA		DRA DR
	F	F
	DRAFT DRAFT DRAF

		Function 0 (default)	Function 1
P0.18	132	GPIO 0, pin 18	ADC2 IN2
P0.19	133	GPIO 0, pin 19	ADC2 IN3
P3.4	134	GPIO 3, pin 4	TIMER3 MAT2
P3.5	135	GPIO 3, pin 5	TIMER3 MAT3
P2.18	136	GPIO 2, pin 18	-
P2.19	137	GPIO 2, pin 19	-
P0.20	138	GPIO 0, pin 20	ADC2 IN4
P0.21	139	GPIO 0, pin 21	ADC2 IN5
P0.22	140	GPIO 0, pin 22	ADC2 IN6
VSS(IO)	141	ground for I/O

Function 2

PWM2 MAT0

PWM2 MAT1

PWM2 MAT4

PWM2 MAT5

PWM1 CAP1

PWM1 CAP2

PWM2 MAT2

PWM2 MAT3

PWM2 MAT4

Function 3	DRAFT DRAFT
EXTBUS A14		DRAFT	D
EXTBUS A15
CAN1 TxD		DRA
CAN1 RxD

EXTBUS D16

EXTBUS D17

EXTBUS A16

EXTBUS A17

EXTBUS A18

P0.23	142	GPIO 0, pin 23	ADC2 IN7
P2.20	143	GPIO 2, pin 20	-
TDI	144	IEEE 1149.1 data in, pulled up internally.

PWM2 MAT5	EXTBUS A19
PWM2 CAP0	EXTBUS D18

7.Functional description

7.1Reset, debug, test and power description

7.1.1Reset and power-up behavior

The LPC2917/19 contains external reset input and internal power-up reset circuits. This ensures that a reset is extended internally until the oscillators and flash have reached a stable state. See Section 11 for trip levels of the internal power-up reset circuit1. See Section 12 for characteristics of the several start-up and initialization times. Table 4 shows the reset pin.

Table 4.	Reset pin
Symbol	Direction	Description
RSTN	in	external reset input, active LOW; pulled up internally

At activation of the RSTN pin the JTAGSEL pin is sensed as logic LOW. If this is the case the LPC2917/19 is assumed to be connected to debug hardware, and internal circuits re-program the source for the BASE_SYS_CLK to be the crystal oscillator instead of the Low-Power Ring Oscillator (LP_OSC). This is required because the clock rate when running at LP_OSC speed is too low for the external debugging environment.

7.1.2Reset strategy

The LPC2917/19 contains a central module, the Reset Generator Unit (RGU) in the Power, Clock and Reset Control Subsystem (PCRSS), which controls all internal reset signals towards the peripheral modules. The RGU provides individual reset control as well as the monitoring functions needed for tracing a reset back to source.

1.Only for 1.8 V power sources

LPC2917_19_1 © NXP B.V. 2007. All rights reserved.

Preliminary data sheet Rev. 1.01 — 15 November 2007 10 of 68