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AT91M40400 Datasheet(PDF) 3 Page - ATMEL Corporation |
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AT91M40400 Datasheet(HTML) 3 Page - ATMEL Corporation |
3 / 7 page AT91M40400 3 Table 1. AT91M40400 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 Timer 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, internal pull-up NTRI Tristate 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 VDD Power GND Ground |
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