ATSAM3X4EA-AU Atmel, ATSAM3X4EA-AU Datasheet - Page 439
ATSAM3X4EA-AU
Manufacturer Part Number
ATSAM3X4EA-AU
Description
ARM Microcontrollers - MCU QFP144,GREEN, IND TEMP, MRL A
Manufacturer
Atmel
Datasheet
1.ATSAM3X8EA-AU.pdf
(1467 pages)
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
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27.9.2.1
27.9.2.2
11057B–ATARM–28-May-12
11057B–ATARM–28-May-12
Byte Write Access
Byte Select Access
Figure 27-5.
Byte write access supports one byte write signal per byte of the data bus and a single read
signal.
Note that the SMC does not allow boot in Byte Write Access mode.
In this mode, read/write operations can be enabled/disabled at byte level. One byte-select line
per byte of the data bus is provided. One NRD and one NWE signal control read and write.
• For 16-bit devices: the SMC provides NWR0 and NWR1 write signals for respectively, byte0
• For 16-bit devices: the SMC provides NBS0 and NBS1 selection signals for respectively
(lower byte) and byte1 (upper byte) of a 16-bit bus. One single read signal (NRD) is provided.
byte0 (lower byte) and byte1 (upper byte) of a 16-bit bus.
Byte Write Access is used to connect 2 x 8-bit devices as a 16-bit memory.
Byte Select Access is used to connect one 16-bit device.
Memory Connection for a 16-bit Data Bus
SMC
D[15:0]
NCS[2]
A[19:2]
NBS0
NBS1
NWE
NRD
A1
D[15:0]
A[18:1]
A[0]
Low Byte Enable
High Byte Enable
Write Enable
Output Enable
Memory Enable
SAM3X/A
SAM3X/A
439
439
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