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SAB80C535 Datasheet(PDF) 11 Page - Infineon Technologies AG |
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SAB80C535 Datasheet(HTML) 11 Page - Infineon Technologies AG |
11 / 56 page SAB 80C515/80C535 Semiconductor Group 10 XTAL2 XTAL1 39 40 36 37 XTAL2 Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL1 Output of the inverting oscillator amplifier. To drive the device from an external clock source, XTAL2 should be driven, while XTAL1 is left unconnected. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is divided down by a divide-by-two flip-flop. Minimum and maximum high and low times and rise/fall times specified in the AC characteristics must be observed. P2.0-P2.7 41-48 38-45 I/O Port 2 is an 8-bit bidirectional I/O port with internal pullup resistors. Port 2 pins that have 1's written to them are pulled high by the internal pullup resistors, and in that state can be used as inputs. As inputs, port 2 pins being externally pulled low will source current (I I L, in the DC characteristics) because of the internal pullup resistors. Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX@DPTR). In this application it uses strong internal pullup resistors when issuing 1's. During accesses to external data memory that use 8-bit addresses (MOVX@Ri), port 2 issues the contents of the P2 special function register. Pin Definitions and Functions (cont’d) Symbol Pin P-LCC-68 Pin P-MQFP-80 Input (I) Output (O) Function |
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