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SAF-C501G-L24N Datasheet(PDF) 11 Page - Siemens Semiconductor Group |
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SAF-C501G-L24N Datasheet(HTML) 11 Page - Siemens Semiconductor Group |
11 / 48 page Semiconductor Group 11 1997-04-01 C501 PSEN 32 29 26 O The Program Store Enable output is a control signal that enables the external program memory to the bus during external fetch operations. It is activated every six oscillator periods except during external data memory accesses. Remains high during internal program execution. RESET 10 9 4 I RESET A high level on this pin for two machine cycles while the oscillator is running resets the device. An internal diffused resistor to V SS permits power-on reset using only an external capacitor to V CC. ALE/PROG 33 30 27 I/O The Address Latch Enable output is used for latching the low-byte of the address into external memory during normal operation. It is activated every six oscillator periods except during an external data memory access. For the C501-1E this pin is also the program pulse input (PROG) during OTP memory programming. EA/ V PP 35 31 29 I External Access Enable When held at high level, instructions are fetched from the internal ROM (C501-1R and C501-1E) when the PC is less than 2000H. When held at low level, the C501 fetches all instructions from external program memory. For the C501-L this pin must be tied low. This pin also receives the programming supply voltage V PP during OTP memory programming (C501-1E) only). *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function P-LCC-44 P-DIP-40 P-MQFP-44 |
Similar Part No. - SAF-C501G-L24N |
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Similar Description - SAF-C501G-L24N |
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