AT91SAM7SE256B-CUR Atmel, AT91SAM7SE256B-CUR Datasheet - Page 166

• 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

22.6.2.3
166
SAM7SE512/256/32 Preliminary
Byte Select Access
Figure 22-6. Memory Connection for 2 x 8-bit Data Path Devices
Byte Select Access is used to connect 16-bit devices in a memory page.
Figure 22-7
device type) on NCS2 (BAT = 1).
Figure 22-7. Connection to a 16-bit Data Path Device with Byte and Half-word Access
• The signal A0/NLB is used as NLB and enables the lower byte for both read and write
• The signal NWR1/NUB is used as NUB and enables the upper byte for both read and write
• The signal NWR0/NWE is used as NWE and enables writing for byte or half-word.
• The signal NRD enables reading for byte or half-word.
operations.
operations.
shows how to connect a 16-bit device with byte and half-word access (e.g., SRAM
SMC
SMC
D[15:8]
A[22:1]
D[15:8]
A[19:1]
NWR1
NWR0
D[7:0]
NCS2
D[7:0]
NCS2
NWE
NRD
NRD
NUB
NLB
A0
D[15:8]
D[7:0]
A[18:0]
Write Enable
Read Enable
Memory Enable
A[18:0]
Write Enable
Read Enable
Memory Enable
D[15:8]
A[18:0]
Low Byte Enable
High Byte Enable
Write Enable
Output Enable
Memory Enable
D[7:0]
6222F–ATARM–14-Jan-11