ATSAM3X4EA-AU Atmel, ATSAM3X4EA-AU Datasheet - Page 452

• Manufacturer Part Number: ATSAM3X4EA-AU
• Description: ARM Microcontrollers - MCU QFP144,GREEN, IND TEMP, MRL A
• Manufacturer: Atmel

Specifications of ATSAM3X4EA-AU

• Rohs: yes
• Core: ARM Cortex M3
• Processor Series: SAM3X
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 84 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 3.6 V
• Operating Temperature Range: - 40 C to +85 C
• Package / Case: LQFP-144
• Mounting Style: SMD/SMT
• Factory Pack Quantity: 60

27.13.1
452
452
SAM3X/A
SAM3X/A
READ_MODE
Setting READ_MODE to 1 indicates to the SMC that the NRD signal is responsible for turning off
the tri-state buffers of the external memory device. The Data Float Period then begins after the
rising edge of the NRD signal and lasts TDF_CYCLES MCK cycles.
When the read operation is controlled by the NCS signal (READ_MODE = 0), the TDF field gives
the number of MCK cycles during which the data bus remains busy after the rising edge of NCS.
Figure 27-17
assuming a data float period of 2 cycles (TDF_CYCLES = 2).
ation when controlled by NCS (READ_MODE = 0) and the TDF_CYCLES parameter equals 3.
Figure 27-17. TDF Period in NRD Controlled Read Access (TDF = 2)
NBS0, NBS1,
illustrates the Data Float Period in NRD-controlled mode (READ_MODE =1),
A[23:2]
D[15:0]
A0, A1
MCK
NRD
NCS
NRD controlled read operation
tpacc
TDF = 2 clock cycles
Figure 27-18
shows the read oper-
11057B–ATARM–28-May-12
11057B–ATARM–28-May-12