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UPD75P0076CU 데이터시트(PDF) 33 Page - Renesas Technology Corp |
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UPD75P0076CU 데이터시트(HTML) 33 Page - Renesas Technology Corp |
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33 / 64 page ![]() µPD75P0076 31 Data Sheet U10232EJ1V1DS 8.3 Steps in Program Memory Read Operation The µPD75P0076 can read out the program memory contents via the following steps. (1) Pull down unused pins to VSS via resistors. Set the X1 pin to low. (2) Apply +5 V to the VDD and VPP pins. (3) Wait 10 µs. (4) Zero-clear mode for program memory addresses. (5) Apply +6 V to VDD and +12.5 V to VPP. (6) Verify mode. When a clock pulse is input to the X1 pin, data is output sequentially to one address at a time based on a cycle of four pulse inputs. (7) Zero-clear mode for program memory addresses. (8) Apply +5 V to the VDD and VPP pins. (9) Power supply OFF The following diagram illustrates steps (2) to (7). VPP VDD VDD + 1 VDD VPP VDD X1 D0/P40-D3/P43 D4/P50-D7/P53 Data output Data output MD0/P30 MD2/P32 MD3/P33 MD1/P31 “L” |
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