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AT91M40800 Datasheet(PDF) 3 Page - ATMEL Corporation |
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AT91M40800 Datasheet(HTML) 3 Page - ATMEL Corporation |
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3 / 153 page  3 AT91X40 Series 1354D–ATARM–05/02 Table 1. AT91X40 Series Pin Description Module Name Function Type Active Level Comments EBI A0 - A23 Address Bus Output – All valid after reset D0 - D15 Data Bus I/O – NCS0 - NCS3 Chip Select Output Low CS4 - CS7 Chip Select Output High A23 - A20 after reset NWR0 Lower Byte 0 Write Signal Output Low Used in Byte Write option NWR1 Upper Byte 1 Write Signal Output Low Used in Byte Write option NRD Read Signal Output Low Used in Byte Write option NWE Write Enable Output Low Used in Byte Select option NOE Output Enable Output Low Used in Byte Select option NUB Upper Byte Select Output Low Used in Byte Select option NLB Lower Byte Select Output Low Used in Byte Select option NWAIT Wait Input Input Low BMS Boot Mode Select Input – Sampled during reset AIC FIQ Fast Interrupt Request Input – PIO-controlled after reset IRQ0 - IRQ2 External Interrupt Request Input – PIO-controlled after reset TC TCLK0 - TCLK2 Timer External Clock Input – PIO-controlled after reset TIOA0 - TIOA2 Multipurpose Timer I/O Pin A I/O – PIO-controlled after reset TIOB0 - TIOB2 Multipurpose Timer I/O Pin B I/O – PIO-controlled after reset USART SCK0 - SCK1 External Serial Clock I/O – PIO-controlled after reset TXD0 - TXD1 Transmit Data Output Output – PIO-controlled after reset RXD0 - RXD1 Receive Data Input Input – PIO-controlled after reset PIO P0 - P31 Parallel IO Line I/O – WD NWDOVF Watchdog Overflow Output Low Open-drain Clock MCKI Master Clock Input Input – Schmidt trigger MCKO Master Clock Output Output – Reset NRST Hardware Reset Input Input Low Schmidt trigger NTRI Tri-state Mode Select Input Low Sampled during reset ICE TMS Test Mode Select Input – Schmidt trigger, internal pull-up TDI Test Data Input Input – Schmidt trigger, internal pull-up TDO Test Data Output Output – TCK Test Clock Input – Schmidt trigger, internal pull-up Power VDDIO I/O Power Power – VDDCORE Core Power Power – GND Ground Ground – |
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