AT91SAM7SE256B-CUR Atmel, AT91SAM7SE256B-CUR Datasheet - Page 213

• 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

23.7.3
Name:
Access:
Reset Value:
• NC: Number of Column Bits
Reset value is 8 column bits.
• NR: Number of Row Bits
Reset value is 11 row bits.
• NB: Number of Banks
Reset value is two banks.
• CAS: CAS Latency
Reset value is two cycles.
In the SDRAMC, only a CAS latency of two cycles is managed. In any case, another value must be programmed.
6222F–ATARM–14-Jan-11
0
0
1
1
TRAS
TWR
TRP
31
23
15
0
0
1
1
–
7
NR
NB
0
1
SDRAMC Configuration Register
NC
0
1
0
1
30
22
14
0
1
0
1
SDRAMC_CR
Read/Write
0x2A99C140
6
Number of Banks
Row Bits
Reserved
CAS
11
12
13
Column Bits
2
4
10
11
8
9
29
21
13
5
TRCD
TXSR
TRC
NB
28
20
12
4
SAM7SE512/256/32 Preliminary
27
19
11
3
NR
26
18
10
2
TRAS
TWR
TRP
25
17
9
1
NC
24
16
8
0
213