Atmel AT73C246-EK1, User Manual

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AT73C246-EK1 Evaluation Kit User Guide 4-3
11047A–PMAAC–08-Apr-10
4.6 Serial Interfaces Header
The USB-to-Serial Card supports I²S, SPI and TWI protocols which configured automatically by the soft-
ware. The following table details the pins assigning for each signal on the GPIO connector (2x10 pins
header Type HE10 for flat cable).
Note: In most cases, a clock must run during any I²S, SPI or TWI write access. In any case of not
using the Serial Board and connecting an external communication system for I²S, SPI or
TWI a clock should be provided to the supported evaluation card.
Notes: 1. An output signal from USB-to-Serial Card to supported card.
2. An input signal from supported card to USB-to-Serial Card.
3. A Bi-dirctional signal.
4. Ground - These pins must be connected between the USB-to-Serial Card and the sup-
ported board.
5. 12.288 MHz Clock - The USB-to-Serial Card’s oscillator provides a 12.288MHz clock
(+3.3V p-p via pin 12). This clock is necessary for driving the digital core of the evalu-
ated board.
Table 4-1. Serial Interface Header Pins Assigning
Pin N° Signal Name Description Pin N° Signal Name Description
1 MOSI SPI Data out
(1)
2 ADJ_VOUT Not Used
3 SPCK SPI CLK
(1)
4 GND Ground
(4)
5 NPCS1 SPI Chip Select 1
(1)
6 +3V3 Not Used
7 NPCS0 SPI Chip Select 0
(1)
8 GND Ground
(4)
9 TWCK TWI CLK
(1)
10 Vin_VDDIO
Input supply from supported
card
(2)
11 LRFS I²S Frame Clock
(1)
12 MCLK
12.288MHz Output clock for
supported digital core
(1)(5)
13 SDIN_Codec I²S Data in
(2)
14 IRQ Interrupt Request
15 SDOUT_Codec I²S Data out
(1)
16 nRST_in Reset in
(2)
17 BCLK_Codec I²S Bit Clock
(1)
18 MISO SPI Data in
(2)
19 AD4 Not Used 20 TWD TWI Data
(3)