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AT91EB42 Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT91EB42 Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 30 page AT91EB42 Evaluation Board User Guide 4-1 Section 4 Circuit Description 4.1 AT91M42800 Processor Figure 6-1 on page 6-2 shows the AT91M42800. The footprint is for a 144-pin TQFP package. Strap CB20 enables the user to choose between the standard ICE debug mode and the JTAG boundary scan mode of operation. The operating mode is defined by the state of the JTAGSEL input detected at reset. Jumper JP5 (see Figure 6-8 on page 6-9 in Section 6, “Appendix B – Schematics”) can be removed by the user to allow measurement of the current demand by the whole microcontroller (V DDIO and VDDCORE). Jumper JP8 can be removed to measure the core microcontroller consumption (V DDCORE). 4.2 Expansion Connectors and JTAG Interface The two expansion connectors, I/O expansion connector and EBI expansion connector, and the JTAG interface are described below. The I/O and EBI expansion connectors’ pinout and position are compatible with the other evaluation boards (except the I/O expansion connector pinout and position of the EB40) so that users can connect their prototype daughter boards to any of these evalu- ation boards. 4.2.1 I/O Expansion Connector The I/O expansion connector makes the general-purpose I/O (GPIO) lines, VCC3V3 and Ground, available to the user. Configuration straps CB2, CB3, CB4, CB11, CB13, CB14, CB15, CB17, CB18 and CB19 are used to select between the I/O lines being used by the evaluation board or by the user via the I/O expansion connector. The con- nector is not fitted at the factory; however, the user can fit any 32 x 2 connector on a 0.1" (2.54 mm) pitch. 4.2.2 EBI Expansion Connector The schematic (Figure 6-4 on page 6-5 in Section 6, “Appendix B – Schematics”) also shows the bus expansion connector which, like the I/O expansion connector, is not fitted at the factory. The user can fit any 32 x 2 connector on a 0.1" (2.54 mm) pitch to gain access to the data, address, chip select, read/write, oscillator output and wait request pins. VCC3V3 and ground are also available on this connector. Configuration strap CB1, when open, allows the user to connect the EBI expansion con- nector to the MPI expansion connector of an AT91EB63 evaluation board without any conflicts. 4.2.3 JTAG Interface An ARM ®-standard 20-pin box header (P5) is provided to enable connection of an ICE interface to the JTAG inputs on the AT91. This allows code to be developed on the board without using system resources such as memory and serial ports. |
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