AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 44

• Manufacturer Part Number: AT91SAM7A1-AU
• Description: IC ARM7 MCU 32BIT ROMLESS144LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7A1-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 40MHz
• Connectivity: CAN, EBI/EMI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Type: ROMless
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: AT91SAM7A1-EK - BOARD EVAL FOR AT91SAM7A1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Figure 10-34. External Accesses with x Internal Wait States and y NWAIT
10.4.4
Table 10-3.
44
Read
Access
tr
tr
tr
tr
tr
tr
tr
ADCRDV2
ADCRDV1
CSLRDV
OELRDV1
OELRDV2
BSLRDV2
BSLRDV1
AT91SAM7A1
Timings
CORECLK
Output enable low to read data valid
Output enable low to read data valid
NOE/NRD
Address
Address change to read data valid
Address change to read data valid
Chip select low to read data valid
Byte select low to read data valid
Byte select low to read data valid
Timings for Read Access
(read/write memory, 0 wait state,
(read/write memory, 0 wait state,
NWAIT
NWE
NCS
(all other cases)
(all other cases)
(standard read)
standard read)
standard read)
Description
(early read)
The following tables show the minimum and maximum timings for external memory read/write
cycles (valid for the recommended operating conditions) for a capacitive load of 15 pF, 40 pF
and 60 pF.
Min
Load = 15pf
(0.5 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
t
t
t
t
t
t
t
19.2ns
11.0ns
10.5ns
11.5ns
11.6ns
18.5ns
12.0ns
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
Max
-
-
-
-
-
-
-
Min
Load = 40pf
(0.5 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
t
t
t
t
t
t
t
22.9ns
12.9ns
12.4ns
13.4ns
13.5ns
22.2ns
13.8ns
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
Max
-
-
-
-
-
-
-
Min
6048B–ATARM–29-Jun-06
Load = 60pf
(0.5 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
(1 + NWS) *
t
t
t
t
t
t
t
25.8ns
14.4ns
13.9ns
14.9ns
15.0ns
25.1ns
15.3ns
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
Max
-
-
-
-
-
-
-