Datasheet

3
1348FS–ATARM–13-Apr-06
AT91M40800
3. Pin Description
Table 3-1. AT91M40800 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
VDD Power Power –
GND Ground Ground –