Atmel Wireless LAN Access Point Uživatelský manuál stáhnout pdf (Strana 10)

Atmel ATWILC1500-MR [PRELIMINARY DATASHEET]

Atmel-42376A-ATWINC1500-MR210P-SmartConnect-Datasheet_102014

5.2 SPI Interface

5.2.1 Overview

Atmel ATWINC1500-MR210P has a Serial Peripheral Interface (SPI) that operates as a SPI slave. The SPI

interface can be used for control and for serial I/O of 802.11 data. The SPI pins are mapped as shown in Table

5-2. The SPI is a full-duplex slave-synchronous serial interface that is available immediately following reset

when pin 10 (SPI_CFG) is tied to VDDIO.

Table 5-2. ATWINC1500-MR210P SPI Interface Pin Mapping

When the SPI is not selected, i.e., when SSN is high, the SPI interface will not interfere with data transfers

between the serial-master and other serial-slave devices. When the serial slave is not selected, its transmitted

data output is buffered, resulting in a high impedance drive onto the MISO line.

The SPI interface responds to a protocol that allows an external host to read or write any register in the chip as

well as initiate DMA transfers.

The SPI SSN, MOSI, MISO and SCK pins of the ATWINC1500-MR210P have internal programmable pull-up

resistors (See “Programmable Pull Up Resistors” on page 14). These resistors should be programmed to be

disabled. Otherwise, if any of the SPI pins are driven to a low level while the ATWINC1500-MR210P is in the low

power sleep state, current will flow from the VDDIO supply through the pull-up resistors, increasing the current

consumption of the module.

SCL, SDA fall time t

300 ns

SCL, SDA rise time t

300 ns This is dictated by external components

START setup time t

SUSTA

0.6 µs

START hold time t

HDSTA

0.6 µs

SDA setup Time t

SUDAT

100 ns

SDA hold time t

HDDAT

0 ns Slave and Master default

40 ns Master programming option

STOP setup time t

SUSTO

0.6 µs

Bus free time between STOP and START t

BUF

1.3 µs

Glitch pulse reject t

0 50 ns

Table 5-1. ATWINC1500-MR210P I

C Timing Parameters (Continued)

Parameter Symbol Min Max Units Remarks

Pin # SPI Function

10 CFG: Must be tied to VDDIO

16 SSN: Active low slave select

15 MOSI(RXD): Serial Data Receive

18 SCK: Serial Clock

17 MISO(TXD): Serial Data Transmit

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 23 24

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