Nxp Semiconductors UM10237 用户手册

UM10237_2

© NXP B.V. 2008. All rights reserved.

TMS

I

TMS — Test Mode Select for JTAG interface.

TRST

I

TRST — Test Reset for JTAG interface.

TCK

10

I

TCK — Test Clock for JTAG interface. This clock must be slower than 

1

⁄

6

 

of the CPU clock (CCLK) for the JTAG interface to operate.

RTCK

I/O

RTCK — JTAG interface control signal.

Note: LOW on this pin while RESET is LOW enables ETM pins (P2[9:0]) 
to operate as Trace port after reset.

RSTOUT

29

K3

O

RSTOUT — This is a 3.3 V pin. LOW on this pin indicates UM10237 
being in Reset state.

RESET

M2

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

44

M4

I

Input to the oscillator circuit and internal clock generator circuits.

XTAL2

46

O

Output from the oscillator amplifier.

RTCX1

34

I

Input to the RTC oscillator circuit.

RTCX2

36

L2

O

Output from the RTC oscillator circuit.

V

SSIO

33, 63, 
77, 93, 
114, 
133, 
148, 
169, 
189, 
200

L3, T5, 
R9, P12, 
N16, 
H14,
E15, 
A12, B6, 
A2

I

ground: 0 V reference for the digital IO pins.

V

SSCORE

32, 84, 
172

K4, P10, 
D12

I

ground: 0 V reference for the core.

V

SSA

J2

I

analog ground: 0 V reference. This should nominally be the same 
voltage as V

SSIO

/V

SSCORE

, but should be isolated to minimize noise and 

error.

V

DD(3V3)

15, 60, 
71, 89, 
112, 
125, 
146, 
165, 
181, 
198

G3, P6, 
P8, U13, 
P17, 
K16,
C17, 
B13, C9, 
D7

I

3.3 V supply voltage: This is the power supply voltage for the I/O ports.

n.c.

30, 117, 
141

 J4, L14, 
G14

I

not connected pins: These pins must be left unconnected (floating).

V

DD(DCDC)(3V3)

26, 86, 
174

H4, P11, 
D11

I

3.3 V DC-to-DC converter supply voltage: This is the power supply for 
the on-chip DC-to-DC converter.

V

DDA

G4

I

analog 3.3 V pad supply voltage: This should be nominally the same 
voltage as V

DD(3V3)

 but should be isolated to minimize noise and error. 

This voltage is used to power the ADC and DAC.

VREF

I

ADC reference: This should be nominally the same voltage as V

DD(3V3)

 

but should be isolated to minimize noise and error. The level on this pin is 
used as a reference for ADC and DAC.

VBAT

38

M3

I

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