SAM7X256 Atmel Corporation, SAM7X256 Datasheet - Page 282

• Manufacturer Part Number: SAM7X256
• Manufacturer: Atmel Corporation

Specifications of SAM7X256

• Flash (kbytes): 256 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 55 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 62
• Ext Interrupts: 62
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 3
• Can: 1
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 64
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

29.3
29.3.1
29.4
29.4.1
29.4.2
29.4.3
282
Application Block Diagram
Product Dependencies
SAM7X512/256/128
I/O Lines Description
I/O Lines
Power Management
Interrupt
Figure 29-2. Application Block Diagram
Table 29-2.
Both TWD and TWCK are bidirectional lines, connected to a positive supply voltage via a current
source or pull-up resistor (see
high. The output stages of devices connected to the bus must have an open-drain or open-col-
lector to perform the wired-AND function.
TWD and TWCK pins may be multiplexed with PIO lines. To enable the TWI, the programmer
must perform the following steps:
The TWI interface may be clocked through the Power Management Controller (PMC), thus the
programmer must first configure the PMC to enable the TWI clock.
The TWI interface has an interrupt line connected to the Advanced Interrupt Controller (AIC). In
order to handle interrupts, the AIC must be programmed before configuring the TWI.
Pin Name
TWD
TWCK
• Program the PIO controller to:
• Enable the peripheral clock.
Rp: Pull up value as given by the I²C Standard
Host with
Interface
– Dedicate TWD and TWCK as peripheral lines.
– Define TWD and TWCK as open-drain.
TWI
TWD
TWCK
I/O Lines Description
Serial EEPROM
Atmel TWI
Slave 1
Pin Description
Two-wire Serial Data
Two-wire Serial Clock
Figure 29-2 on page
I²C RTC
Slave 2
Controller
I²C LCD
Slave 3
282). When the bus is free, both lines are
I²C Temp.
Slave 4
Sensor
Rp
6120I–ATARM–06-Apr-11
Input/Output
Input/Output
Type
Rp
VDD