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SAB80C537 Datasheet(PDF) 11 Page - Infineon Technologies AG |
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SAB80C537 Datasheet(HTML) 11 Page - Infineon Technologies AG |
11 / 61 page SAB 80C517/80C537 Semiconductor Group 10 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O *) Function P-LCC-84 P-MQFP-100-2 XTAL2 39 12 – XTAL2 Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL1 40 13 – 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 devided down by a divide-by-two flip-flop. Minimum and maximum high and low times as well as rise/fall times specified in the AC characteristics must be observed. P2.0 - P2.7 41 - 48 14 - 21 I/O Port 2 is a bidirectional I/O port with internal pull-up resistors. Port 2 pins that have 1 s written to them are pulled high by the internal pull-up resistors, and in that state can be used as in-puts. As inputs, port 2 pins being externally pulled low will source current (IIL, in the DC characteristics) because of the internal pull-up 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 pull-up 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. * I = Input O = Output |
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