3

6308A–DRMSD–10-May-07

ATSAM2195

Table 2-2.

Serial MIDI, parallel MIDI (MPU-401)

Pin Name

Pin #

Type

Function

MIDI IN

10

IN

Serial TTL MIDI IN. Connected to the built-in synthesizer at power-up or after

MPU reset. Connected to the D0-D7 bus (read mode) when MPU switched to

UART mode. This pin should be tied HIGH if not used.

D0-D7

15, 16, 17, 18,

22, 23, 24, 25

I/O

8 bit bi-directional bus, under control of CS, RD, WR. These pins have a built-in

pull down. They should be left unconnected if not used

A0

11

IN

Select data(0) or control(1) for write, data(0) or status(1) for read. This pin has a

built-in pull-down. It should be left unconnected if not used.

CS

12

IN

Chip select, active low. This pin has a built-in pull up. It should be left

unconnected if not used.

RD

13

IN

Read, active low. When CS and RD are low, data(A0=0) or status(A0=1) is read

on D0-D7. Read data is acknowledged on the rising edge of RD. This pin has a

built-in pull up. It should be left unconnected if not used.

WR

14

IN

Write, active low. When CS and WR are low, data (A0=0) or control (A0=1) is

written from the D0-D7 bus to the ATSAM2195 on the rising edge of WR. This pin

has a built-in pull up. It should be left unconnected if not used.

IRQ

26

OUT

A rising edge indicates that a MIDI byte is available for read on D0-D7.

Acknowledged by reading the byte.

Table 2-3.

Analog audio group

Pin Name

Pin #

Type

Function

AGNDREF

42

IN

These pin is used as a reference by the internal DAC. It should be connected to a

clean analog ground plane

VREF

41

OUT

Reference voltage. Generated on-chip. Should be stabilized by external

capacitors 10 µF // 100 nF to AGND.

VCM

40

OUT

On-chip output stage common-mode voltage. Should be stabilized by external

capacitors 10 µF // 100 nF to AGND.

VBG

3

OUT

Bandgap voltage. Can be stabilized by capacitors 1µF // 100 nF to AGND. Can be

left unconnected for low-cost application.

AOUTL

1

OUT

Left channel audio output

AOUTR

5

OUT

Right channel audio output

Table 2-4.

Digital audio group

Pin Name

Pin #

Type

Function

OUTLEV

6

IN

Selects the full scale output level for AOUTL and AOUTR.

OUTLEV = 0 for 1.1Vpp

OUTLEV = 1 for 2.2Vpp

If 1.8V single supply (VA33 = 1.8V), OUTLEV should be tied to 0.

DITH0-DITH1

7, 8

IN

Activate a dither signal to reduce eventual noise tones at the output. See Dither

Modes Description.