AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 244
AT91SAM7A1-AU
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
-
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Manufacturer
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• PCS[3:0]: Peripheral Chip Select
This field is only used if single peripheral select is active (PS = 0).
If PCSDEC = 0:
where x = don't care.
If PCSDEC = 1:
• DLYBCS[7:0]: Delay Between Chip Selects
This field defines the delay from one NPCS inactive to the activation of another NPCS. The DLYBCS[7:0] time will guaran-
tee non-overlapping chip selects and resolves bus contentions in case of peripherals with long data float times.
When DLYBCS[7:0] is less than six, six SPI Master Clock periods are inserted by default.
Else, the following equation determines the delay:
244
PCS[3:0] = xxx0
PCS[3:0] = xx01
PCS[3:0] = x011
PCS[3:0] = 0111
PCS[3:0] = 1111
NPCS[3:0] output signals = PCS[3:0]
AT91SAM7A1
NPCS_to_SCK_Delay
NPCS[3:0] = 1110
NPCS[3:0] = 1101
NPCS[3:0] = 1011
NPCS[3:0] = 0111
forbidden (no peripheral is selected)
=
DLYBCS[7:0]
SPI_Master_Clock_Period
6048B–ATARM–29-Jun-06
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