AT91R40807-33AU Atmel, AT91R40807-33AU Datasheet - Page 16

• Manufacturer Part Number: AT91R40807-33AU
• Description: IC ARM7 MCU 100TQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91R40807-33AU

• 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: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Timer/Counter Signals
Reset Signals
16
AT91R40807
Due to internal synchronization of input signals, there is a delay between an input event and a
corresponding output event. This delay is 3(t
in Waveform Total-count Detection mode. The inputs have to meet the minimum pulse width
and minimum input period shown in Tables 16 and 17 and as represented in Figure 7.
Table 16. Timer Input Minimum Pulse Width
Table 17. Timer Input Minimum Period
Figure 7. Timer Input
A minimum pulse width is necessary as shown in Table 18 and as represented in Figure 8.
Table 18. Reset Minimum Pulse Width
Figure 8. Reset Signal
Only the NRST rising edge is synchronized with MCKI. The falling edge is asynchronous.
Symbol
TC
Symbol
TC
Symbol
RST
TIOA/TIOB/TCLK
1
2
1
NRST
Parameter
TCLK/TIOA/TIOB Minimum Pulse Width
Parameter
TCLK/TIOA/TIOB Minimum Input Period
MCKI
Parameter
NRST Minimum Pulse Width
3(t
CP
TC
/2)
1
CP
) in Waveform Event Detection mode and 4(t
TC
RST
2
1
Min Pulse Width
Min Input Period
Min Pulse Width
3(t
5(t
10(t
CP
CP
3(t
CP
/2)
/2)
CP
)
/2)
1367C–01/02
Units
Units
Units
ns
ns
ns
CP
)