AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 252

• Manufacturer Part Number: AT91SAM7A1-AU
• Description: IC ARM7 MCU 32BIT ROMLESS144LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7A1-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 40MHz
• Connectivity: CAN, EBI/EMI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Type: ROMless
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: AT91SAM7A1-EK - BOARD EVAL FOR AT91SAM7A1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

• DLYBS[7:0]: Delay Before SCK
This field defines the length of delay from NPCS valid to the first valid SCK transition.
When DLYBS[7:0] equals zero, the NPCS valid to SCK transition is one-half SCK clock period.
Else, the following equation determines the delay:
NPCS_to_SCK_Delay
=
DLYBS[7:0}
SPI_Master_Clock_Period
• DLYBCT[7:0]: Delay Between Consecutive Transfers
This field determines the delay between two consecutive transfers with the same peripheral without removing the chip
select or the length of delay after transfer before chip select is deselected.
When DLYBCT[7:0] equals zero, the delay is equal to four SPI Clock periods.
Else, the following equation determines the delay:
Delay_After_Transfer
=
32
DLYBCT[7:0]
SPI_Master_Clock_Period
AT91SAM7A1
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6048B–ATARM–29-Jun-06