SAM9X25 Atmel Corporation, SAM9X25 Datasheet - Page 755

• Manufacturer Part Number: SAM9X25
• Manufacturer: Atmel Corporation

Specifications of SAM9X25

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 7
• Can: 2
• Lin: 4
• Ssc: 1
• Ethernet: 2
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: DDR/LPDDR, SDRAM/LPSDR
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

38.7.2
38.8
38.8.1
38.8.2
38.8.3
38.8.4
11054A–ATARM–27-Jul-11
11054A–ATARM–27-Jul-11
Master Mode
Modes of Operation
Definition
Application Block Diagram
Programming Master Mode
Master Transmitter Mode
The TWI has six modes of operations:
These modes are described in the following chapters.
The Master is the device that starts a transfer, generates a clock and stops it.
Figure 38-5. Master Mode Typical Application Block Diagram
The following registers have to be programmed before entering Master mode:
After the master initiates a Start condition when writing into the Transmit Holding Register,
TWI_THR, it sends a 7-bit slave address, configured in the Master Mode register (DADR in
• Master transmitter mode
• Master receiver mode
• Multi-master transmitter mode
• Multi-master receiver mode
• Slave transmitter mode
• Slave receiver mode
1. DADR (+ IADRSZ + IADR if a 10 bit device is addressed): The device address is used
2. CKDIV + CHDIV + CLDIV: Clock Waveform.
3. SVDIS: Disable the slave mode.
4. MSEN: Enable the master mode.
Rp: Pull up value as given by the I²C Standard
Host with
Interface
to access slave devices in read or write mode.
TWI
TWD
TWCK
Serial EEPROM
Atmel TWI
Slave 1
I²C RTC
Slave 2
Controller
I²C LCD
Slave 3
I²C Temp.
Sensor
Slave 4
Rp
SAM9X25
SAM9X25
Rp
VDD
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