3

ATSAM9753

1774D–DRMSD–11/02

Pin Description

Table 1. Pin Description by Function

Pin Name

Pin Number

Type

Function

Power Supply

(1)

GND

4, 17, 24, 32, 42, 52, 56,

65, 77, 90, 97, 102, 110,

125, 130, 140

PWR

Digital Ground

All pins should be connected to a ground plane.

AGND

103

PWR

Analog Ground for the ADC

VCC

5, 18, 31, 41, 51, 66, 78,

91, 111, 126, 139

PWR

Power Supply, 3.3V/5V ± 10%

VC3

23, 55, 96, 101, 129

PWR

Core power, +3.3V nominal (3.3V ± 10%).

AVC3

107

PWR

Analog power for the ADC, +3.3V nominal (3.3V ± 10%)

Serial MIDI

MIDI_IN

94

IN

Serial MIDI_IN

MIDI_OUT

95

OUT

Serial MIDI_OUT

External PCM ROM/RAM/I/O

WA[23:0]

47 - 50, 53, 54, 57 - 64,

67 - 76

OUT

External memory I/O address. Up to 16M x 16 for direct ROM/RAM

connection.

WD[15:0]

19 - 22, 25 - 30, 33 - 38

I/O

External memory I/O data. Data is read (input) when RD is low, written

(output) when WR is low.

RD

39

OUT

External ROM/RAM/peripherals read

WR

40

OUT

External RAM/peripherals write

CS[1:0]

43, 44

OUT

Programmable chip selects. Can be configured to handle several ROMs or

mixed RAM/ROM/FLASH.

XIO[1:0]

45, 46

OUT

External peripherals chip select. Each peripheral maps onto 4K bytes

address space for optional further decoding.

Keyboard, Switches, LEDs, Sliders, Scanning

KBDIO

119

OUT

If 1: BR[10:0] and MK[10:0] hold keyboard contact input data.

If 0: BR[10:0] holds switch status input, MK[10:0] holds LED data output.

ROW[2:0]

115 - 117

OUT

Row select: Keyboard, switches/LEDs, external slider analog multiplexer

(4051) channel select. Eight rows combined with eleven BR/MK columns

allow to control 88 keys, 88 switches, 88 LEDs and 8 sliders. The

programmable bit GPIO0 allows control to be extended to 176 switches and

16 sliders when programmed as ROW3.