AT91SAM7S256C-MU Atmel, AT91SAM7S256C-MU Datasheet - Page 300

• Manufacturer Part Number: AT91SAM7S256C-MU
• Description: IC ARM7 MCU 32BIT 256K 64-QFN
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7S256C-MU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• Processor Series: AT91
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 64 KB
• Interface Type: SPI, TWI, USART, USB
• Maximum Clock Frequency: 55 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 5
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT91SAM7S256-MU; AT91SAM7S256-MU

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AT91SAM7S Series Preliminary
Figure 29-14. TWI Write Operation with Single Data Byte and Internal Address
(CLDIV, CHDIV, CKDIV) in TWI_CWGR
- Internal address size (IADRSZ)
- Device slave address (DADR)
Set the Master Mode register:
Write ==> bit MREAD = 0
TWI_THR = Data to send
Set the internal address
Set the Control register:
TWI_IADR = address
Load transmit register
- Transfer direction bit
Read Status register
Read Status register
(Needed only once)
TWI_CR = MSEN
Transfer finished
Yes
- Master enable
TXCOMP = 1?
Set TWI clock
TXRDY = 1?
Yes
BEGIN
No
No
6175K–ATARM–30-Aug-10