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C517A Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
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C517A Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
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9 / 72 page  Semiconductor Group 7 C517A VSS 10, 62 37, 83 – Ground (0V) during normal, idle, and power down operation. VDD 11, 63 38, 84 – Supply voltage during normal, idle, and power down mode. XTAL2 1239– XTAL2 is the input to the inverting oscillator amplifier and input to the internal clock generator circuits. To drive the device from an external clock source, XTAL2 should be driven, while XTAL1 is left unconnected. Minimum and maximum high and low times as well as rise/ fall times specified in the AC characteristics must be observed. XTAL1 1340– XTAL1 is the output of the inverting oscillator amplifier. This pin is used for the oscillator operation with crystal or ceramic resonator. P2.0 - P2.7 14 - 21 41 - 48 I/O Port 2 is an 8-bit quasi-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 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 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 Table 1 Pin Definitions and Functions (cont’d) 6\PERO 3LQ1XPEHU ,2 )XQFWLRQ 304)3 3/&& |
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