AT91SAM7SE256B-AUR Atmel, AT91SAM7SE256B-AUR Datasheet - Page 358

• Manufacturer Part Number: AT91SAM7SE256B-AUR
• Description: IC ARM7 MCU FLASH 256K 128-LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7SE256B-AUR

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: EBI/EMI, I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 88
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K 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: *
• Processor Series: SAM7SE256
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 32 KB
• Interface Type: SPI, USB
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 88
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 85 C
• Processor To Be Evaluated: AT91SAM7SE256B
• Supply Current (max): 60 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

32.7.7
358
SAM7SE512/256/32 Preliminary
Read-write Flowcharts
The following flowcharts shown in
page
give examples for read and write operations. A polling or interrupt method can be used to check
the status bits. The interrupt method requires that the interrupt enable register (TWI_IER) be
configured first.
Figure 32-14. TWI Write Operation with Single Data Byte without Internal Address
360,
Figure 32-17 on page
(CLDIV, CHDIV, CKDIV) in TWI_CWGR
- Device slave address (DADR)
Set the Master Mode register:
361,
TWI_CR = MSEN + SVDIS
Write ==> bit MREAD = 0
TWI_THR = Data to send
Set the Control register:
Load Transmit register
- Transfer direction bit
Read Status register
Read Status register
Figure
(Needed only once)
Transfer finished
- Master enable
TXCOMP = 1?
Set TWI clock
Figure 32-18 on page 362
TXRDY = 1?
Yes
Yes
BEGIN
32-14,
Figure 32-15 on page
No
No
and
Figure 32-19 on page 363
359,
6222F–ATARM–14-Jan-11
Figure 32-16 on