AT91SAM7SE256B-AU Atmel, AT91SAM7SE256B-AU Datasheet - Page 164
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AT91SAM7SE256B-AU
Manufacturer Part Number
AT91SAM7SE256B-AU
Description
IC ARM7 MCU FLASH 256K 128-LQFP
Manufacturer
Atmel
Series
AT91SAMr
Datasheet
1.AT91SAM7SE256-AU.pdf
(673 pages)
Specifications of AT91SAM7SE256B-AU
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
*
Core
ARM7TDMI
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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22.6.1.2
Figure 22-3. Memory Connections for Eight External Devices
Note:
22.6.1.3
164
1. The maximum address space per device is 8 Mbytes.
SAM7SE512/256/32 Preliminary
SMC
Chip Select Lines
Data Bus Width
NWR[1:0]
NCS[7:0]
A[22:0]
D[15:0]
NRD
The Static Memory Controller provides up to eight chip select lines: NCS0 to NCS7.
A data bus width of 8 or 16 bits can be selected for each chip select. This option is controlled by
the DBW field in the SMC_CSR for the corresponding chip select. See
ters” on page
Figure 22-4
Figure 22-4. Memory Connection for an 8-bit Data Path Device
Figure 22-5
shows how to connect a 512K x 8-bit memory on NCS2 (DBW = 10).
shows how to connect a 512K x 16-bit memory on NCS2 (DBW = 01).
196.
SMC
D[15:8]
A[22:1]
NWR1
NWR0
D[7:0]
NCS2
NRD
A0
(1)
8 or 16
NCS0
NCS1
NCS2
Memory Enable
Output Enable
Write Enable
A[22:0]
D[15:0] or D[7:0]
NCS3
Memory Enable
NCS4
NCS5
Memory Enable
Memory Enable
NCS6
Memory Enable
NCS7
A[22:1]
A0
Write Enable
Output Enable
Memory Enable
D[7:0]
Memory Enable
Memory Enable
Memory Enable
“SMC Chip Select Regis-
6222F–ATARM–14-Jan-11
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