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CY7C1019-V Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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CY7C1019-V Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 17 page 11 The TOSC switch The TOSC inputs can be configured as normal I/O pins, or as input pins for a low-frequency oscillator that can clock the asynchronous timer. The STK503 has a 32kHz crystal that can be connected to these pins. The TOSC switch selects what is connected to the TOSC pins on the AVR: • Normal port pins - the TOSC pins are connected to the PORTG connector (set the switch to the position indicated by the text PORTG) • 32kHz crystal (set the switch to the position nearest the 32kHz crystal) The External Memory Interface The AVRs supported by STK503 can access external memories or peripherals through its External Memory Interface. This interface consist of PORTA (multiplexed data and address low byte), PORTC (address high byte), and PORTG[2:0] (RD, WR and ALE). SRAM footprint STK503 has a footprint where an SRAM chip can be mounted. The footprint takes 128Kx8 SOJ and TSOP packages. Figure 6-1: The SRAM footprint. The arrow shows pin 1. |
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