8

4890AS–GPS–09/05

ATR0621 [Preliminary]

3.2

Signal Description

VBAT18

G6

OUT

VDD18

E6

IN

VDD18

F7

IN

VDD18

F6

IN

E5

IN

F5

IN

XT_IN

J9

IN

XT_OUT

J10

OUT

Table 3-1.

ATR0621 Pinout (Continued)

Pin Name

LFBGA100

Pin Type

Pull Resistor

Firmware Label

PIO Bank A

PIO Bank B

Notes:

1. PD = internal pull-down resistor, PU = internal pull-up resistor, OH = switched to Output High at reset

2. VDDIO is the supply voltage for the following GPIO pins: P1, P2, P8, P12, P14, P16, P17, P18, P19, P20, P21, P23, P24,

P25, P26, P27 and P29

3. VDD_USB is the supply voltage for the following USB pins: USB_DM and USB_DP. For operation of the USB interface, sup-

ply of 3.0V to 3.6V is required.

Table 3-2.

ATR0621 Signal Description

Module

Name

Function

Type

Active Level Comment

EBI

EM_A0 to EM_A21

External Memory Address Bus

Output

–

All valid after reset

EM_DA0 to EM_DA15 External Memory Data Bus

I/O

–

Internal pull-down resistor

NCS0 to NCS1

Chip Select

Output

Low

Output High in RESET state

NCS2 to NCS3

Chip Select

Output

Low

Output High in RESET state

NWR0

Lower Byte Write Signal

Output

Low

Output High in RESET state

NWR1

Upper Byte Write Signal

Output

Low

Output High in RESET state

NRD

Read Signal

Output

Low

Output High in RESET state

NWE

Write Enable

Output

Low

Output High in RESET state

NOE

Output Enable

Output

Low

Output High in RESET state

NUB

Upper Byte Select (16-bit SRAM)

Output

Low

Output High in RESET state

NLB

Lower Byte Select (16-bit SRAM)

Output

Low

Output High in RESET state

BOOT_MODE

Boot Mode Input

Input

–

PIO-controlled after reset,

internal pull-down resistor

USART

TXD1-2

Transmit Data Output

Output

–

PIO-controlled after reset

RXD1-2

Receive Data Input

Input

–

PIO-controlled after reset

SCK1-2

External Synchronous Serial

Clock

I/O

–

PIO-controlled after reset

USB

USB_DP

USB Data (D+)

I/O

–

USB_DM

USB Data (D-)

I/O

–

APMC

RF_ON

Output

–

Interface to ATR0600

RTC

NSLEEP

Sleep Output

Output

Low

Interface to ATR0600

NSHDN

Shutdown Output

Output

Low

Connect to pin LDO_EN

XT_IN

Oscillator Input

Input

–

RTC oscillator

XT_OUT

Oscillator Output

Output

–

RTC oscillator