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C513A-HN Datasheet(PDF) 10 Page - Siemens Semiconductor Group |
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C513A-HN Datasheet(HTML) 10 Page - Siemens Semiconductor Group |
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10 / 43 page  Semiconductor Group 10 C511 / C513 XTAL1 21 15 – XTAL1 Input to the inverting oscillator amplifier and input to the internal clock generator circuits. To drive the device from an external clock source, XTAL1 should be driven, while XTAL2 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 as well as rise/fall times specified in the AC characteristics must be observed. P2.0-P2.7 24-31 18-25 I/O Port 2 is a bidirectional I/O port with internal pullup resistors. Port 2 pins that have 1s 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 IL, 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 1s. During accesses to external data memory that use 8-bit addresses (MOVX @Ri), port 2 issues the contents of the P2 special function register. PSEN 32 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 periodes except during external data memory accesses. Remains high during internal program execution. RESET 10 4 I RESET A high level on this pin for two machine cycles while the oscillator is running resets the device. An internal resistor to V SS permits power-on reset using only an external capacitor to V CC. *) I = Input O = Output Table 3 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function P-LCC- 44 P-MQFP- 44 |
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