AT91SAM7SE256B-CUR Atmel, AT91SAM7SE256B-CUR Datasheet - Page 187

• 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

Figure 22-37. Read Access in Standard Protocol using NWAIT
Note:
22.6.7.4
6222F–ATARM–14-Jan-11
synchronized
NWR0/NWE
NWR1/NUB
internally
A0/NLB
NWAIT
NWAIT
D[15:0]
A[22:1]
MCK
NRD
NCS
1. Read access, memory data bus width = 16, NWS = 5, WSEN = 1
Memory Access Example Waveforms
Figure 22-38 on page 188
write accesses to the various associated external memory devices. The configurations
described are shown in
Table 22-3.
Wait Delay Falling from NRD/NOE
0002C44
Figure Number
Figure 22-38
Figure 22-39
Figure 22-40
Figure 22-41
Figure 22-42
Figure 22-43
Figure 22-44
0003
Memory Access Waveforms
Table
through
Number of Wait
22-3.
States
Figure 22-44 on page 194
0
1
1
0
1
1
0
SAM7SE512/256/32 Preliminary
(1)
Bus Width
16
16
16
16
8
8
8
show the waveforms for read and
Size of Data Transfer
Half-word
Half-word
Word
Word
Word
Byte
Byte
187