AT91SAM7SE256B-CUR Atmel, AT91SAM7SE256B-CUR Datasheet - Page 164

• Manufacturer Part Number: AT91SAM7SE256B-CUR
• Description: IC ARM7 MCU FLASH 256K 128-LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7SE256B-CUR

• 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: *
• Processor Series: SAM7SE256
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 32 KB
• Interface Type: SPI, USB
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 88
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 85 C
• Processor To Be Evaluated: AT91SAM7SE256B
• Supply Current (max): 60 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

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