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PEF2045-N Datasheet(PDF) 4 Page - Siemens Semiconductor Group |
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PEF2045-N Datasheet(HTML) 4 Page - Siemens Semiconductor Group |
4 / 53 page Semiconductor Group 4 PEB 2045 PEF 2045 Pin Definitions and Functions (cont’d) Pin No. P-LCC Pin No. P-DIP Symbol Input (I) Output (O) Function 25 23 WR I Write: This signal initiates a write operation. The WR input is internally sampled only if CS is active. In this case the MTSC loads an internal register with data from the data bus at the rising edge of WR. WR is active low. 26 27 29 30 31 32 33 34 24 25 26 27 28 29 30 31 DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 I/O I/O I/O I/O I/O I/O I/O I/O Data Bus: The data bus is used for communication between the MTSC and a processor. 35 36 37 38 40 41 42 43 32 33 34 35 36 37 38 39 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 OUT0 0 0 0 0 0 0 0 0 PCM-Output Port: Serial data is sent by these lines at standard CMOS or TTL levels. These pins can be tristated. 44 40 CLK I Clock: 4096- or 8192-kHz device clock. |
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