SAM5708B datasheet(21/89 Pages) ETC1

21 / 89 page

SAM5708B

SAM5708B.pdf

– Rev 14/05/2018

4.3.2. Test, Reset, Oscillators, USB, ADC, MIDI, Debug.

Pin name

Pin#

Type

Mem

Cfg

Description

TEST

In PD

1-6

Test input. Should be grounded or left open.

RST/

1-6

Master reset and Power down. Schmitt trigger input. RST/

should be held low during at least 10ms after power is

applied.

On the rising edge of RST/ the chip enters its initialization

routine.

OSC1_X1-

OSC1_X2

89,90

1-6

Main Oscillator OSC1

- Dual crystal design: 12 MHz external crystal connection for

USB embedded Ports and Ethernet controller.

- Single crystal design: USB, Ethernet, System and audio

clocks are derived fromOSC1. Crystal value can be:

° 12MHz if USB or Ethernet in use.

° 11.2896MHz or 12.288MHz if USB is not used

- An external clock can be connected to OSC1_X1.

OSC2_X1-

OSC2_X2

121,122

1-6

- Dual crystal design: System and audio clocks are derived

from

OSC2_X1-OSC2_X2.

Crystal

value

can

11.2896MHz or 12.288MHz.

Single

crystal

design:

These

pins

should

left

unconnected.

- An external clock can be connected to OSC2_X1. (e.g.,

enslavement to external VCX0 driven by SAM5708B PWM

generator)

USBDM

I/O

1-6

USB D- connection (analog) of USB Port

USBDP

I/O

1-6

USB D+ connection (analog) of USB Port

USBREF

1-6

A 12k

Ω ± 1% resistor should be connected between this pin

and GNDU. Unconnected if USB Port is not used.

USBID

In 5VT

1-6

USB ID. Detect if A device or B device in case of USB Port

running in Dual Role mode.

MIDI_OUT2

Out DR4

1-6

Additional Serial MIDI Out.

P8.15

I/O 5VT

DR4

1-6

General purpose I/O pin.

VIN

1-6

Analog input of embedded ADC: Multiple sliders should be

connected through external analog multiplexer like 4051.

Channels should be selected by ROW0-ROW3 if available,

or GPIOs.

MIDI_IN1

In 5VT (PU)

1-6

Serial MIDI In.

MIDI_IN2

In 5VT (PU)

1-6

Additional Serial MIDI In.

P0.14

I/O 5VT

(PU) DR4

1-6

General purpose I/O pin.

MIDI_OUT1

Out DR4

1-6

Serial MIDI Out.

P0.9

I/O DR4

1-6

General purpose I/O pin.

MC2

1-6

Memory Config 2. This pin is sensed at power up.

MC2|MC1|MC0 setting allows boot ROM code to start the

right Memory Config.

STIN

In PD

1-6

Serial test input. This is a 57.6 kbauds asynchronous input

used for firmware debugging. This pin is tested at power-up.

The built-in debugger starts if STIN is found high. It should

be grounded or left open for normal operation.

STOUT

Out DR4

1-6

Serial test output. 57.6 kbauds async output used for

firmware debugging.

MIDI_IN2

In (PU)

1-6

Additional Serial MIDI In.

P0.15

I/O (PU)

DR4

1-6

General purpose I/O pin.

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