SAM7SE256 Atmel Corporation, SAM7SE256 Datasheet - Page 372

• Manufacturer Part Number: SAM7SE256
• Manufacturer: Atmel Corporation

Specifications of SAM7SE256

• Flash (kbytes): 256 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 48 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 88
• Ext Interrupts: 88
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 3
• Ssc: 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): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

Figure 32-28. Clock Synchronization in Write Mode
Notes:
372
Clock Synchronization in Write Mode
TWI_RHR
TXCOMP
SVREAD
SCLWS
RXRDY
SVACC
TWCK
1. At the end of the read sequence, TXCOMP is set after a STOP or after a REPEATED_START + an address different from
2. SCLWS is automatically set when the clock synchronization mechanism is started and automatically reset when the mecha-
TWD
SAM7SE512/256/32
SADR.
nism is finished.
S
SADR
As soon as a START is detected
The c lock is tied lo w if the shift register and the TWI_RHR is full. If a STOP or
REPEATED_START condition was not detected, it is tied low until TWI_RHR is read.
Figure 32-28 on page 372
W
A
DATA0
CLOCK is tied low by the TWI as long as RHR is full
A
describes the clock synchronization in Read mode.
DATA1
DATA0 is not read in the RHR
SCL is stretched on the last bit of DATA1
Rd DATA0
A
Rd DATA1
DATA1
DATA2
NA
Rd DATA2
DATA2
6222F–ATARM–14-Jan-11
S
ADR