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UPD78CP18 Datasheet(PDF) 21 Page - NEC |
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UPD78CP18 Datasheet(HTML) 21 Page - NEC |
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21 / 50 page  21 µPD78CP18(A) Caution When +12.5 V is applied to VPP and +6 V is applied to VDD, setting both CE and OE to “L” is prohibited. Table 4-3. Recommended Connection of Unused Pins (in PROM Programming Mode) Operating Mode CENote OENote VPPNote VDDNote RESET MODE0 MODE1 Program L H +12.5 V +6 V L H L Program verify H L Program inhibit H H Read L L +5 V +5 V Output disable L H Standby H L/H Note These pins correspond to the µPD27C256A. 4.1 PROM PROGRAMMING OPERATING MODES The PROM programming operating mode is set as shown in Table 4-2. Pins not used for programming should be handled as shown in Table 4-3. Table 4-2. PROM Programming Modes Pin Recommended Connection INT1 Connect to VSS. X1 AN0 to AN7 VAREF AVDD AVSS Pins other than the Connect to VSS via individual resistor. above X2 Leave open. |
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