AT91SAM7A1-AU Atmel, AT91SAM7A1-AU Datasheet - Page 47

• 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 10-36. Write Access Waveform
Table 10-5.
Figure 10-37. External NWAIT Waveform
6048B–ATARM–29-Jun-06
Write
Access
tw
tw
tw
tw
NW0/NW1 (Write Select)
NUB/NLB (Byte Select)
NUB/NLB (Byte Select)
SADCWSL
SCSAWSL
SPL
SWSHADC
NCSx (Write Select)
NWE (Byte Select)
ADDRESS
ADDRESS
Description
Address/NUB/NLB change to
NWAIT active
Chip select active to NWAIT
active
NWAIT pulse
NWAIT inactive to
address/NUB/NLB/chip select
change
Timings for External NWAIT
NWAIT
D [15:0]
NCSy
NCS
NOE
tw
CSHDD
tw
tw
tw
SADCWSL
SCSAWSL
2 * t
OEHDD
t
CYCLE
Min
tw
CYCLE
ADSWL
Load = 15pf
(0.5 + NWS) *
(0.5 + NWS) *
3 * t
t
t
16.8ns
15.8ns
CYCLE
CYCLE
Max
CYCLE
tw
SPL
-
-
tw
WPL 1/2
tw
2 * t
DSWH 1/2
t
CYCLE
Min
CYCLE
tw
Load = 40pf
Data Out Valid
SWSHADC
tw
ADHWH 1/2
(0.5 + NWS) *
(0.5 + NWS) *
3 * t
t
t
23.5ns
22.5ns
CYCLE
CYCLE
tw
Max
CYCLE
DHWH 1/2
-
-
AT91SAM7A1
2 * t
t
CYCLE
Min
CYCLE
Load = 60pf
(0.5 + NWS) *
(0.5 + NWS) *
3 * t
t
t
26.9ns
25.8ns
CYCLE
CYCLE
Max
CYCLE
-
-
47