AT91R40807-33AI Atmel, AT91R40807-33AI Datasheet - Page 31

• Manufacturer Part Number: AT91R40807-33AI
• Description: IC ARM7 MCU 176 TQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91R40807-33AI

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 136K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

External Wait
1354D–ATARM–08/02
Figure 19. Data Float Output Time
Notes:
The NWAIT input can be used to add wait states at any time. NWAIT is active low and is
detected on the rising edge of the clock.
If NWAIT is low at the rising edge of the clock, the EBI adds a wait state and changes
neither the output signals nor its internal counters and state. When NWAIT is de-
asserted, the EBI finishes the access sequence.
The NWAIT signal must meet setup and hold requirements on the rising edge of the
clock.
Figure 20. External Wait
Notes:
1. Early Read Protocol
2. Standard Read Protocol
1. Early Read Protocol
2. Standard Read Protocol
NWAIT
ADDR
NWE
MCK
NRD
D0 - D15
NCS
ADDR
NCS
MCK
NRD
(1)
(1)
(2)
(2)
AT91X40 Series
t
DF
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