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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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Q67127-C1071 데이터시트(PDF) 11 Page - Siemens Semiconductor Group |
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Q67127-C1071 데이터시트(HTML) 11 Page - Siemens Semiconductor Group |
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11 / 67 page  Semiconductor Group 11 1997-10-01 C517A P4.0 - P4.7 64 - 66, 68 - 72 I/O Port 4 is an 8-bit quasi-bidirectional I/O port with internal pull-up resistors. Port 4 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 inputs. As inputs, port 4 pins being externally pulled low will source current (I IL, in the DC characteristics) because of the internal pull-up resistors. PE/SWD 67 I Power saving mode enable / Start watchdog timer A low level at this pin allows the software to enter the power saving modes (idle mode, slow down mode, and power down mode). In case the low level is also seen during reset, the watchdog timer function is off on default. Usage of the software controlled power saving modes is blocked, when this pin is held at high level. A high level during reset performs an automatic start of the watchdog timer immediately after reset. When left unconnected this pin is pulled high by a weak internal pull-up resistor. During hardware power down the pullup resistor is switched off. RESET 73 I RESET A low level on this pin for the duration of two machine cycles while the oscillator is running resets the C517A. A small internal pullup resistor permits power-on reset using only a capacitor connected to VSS . VAREF 78 – Reference voltage for the A/D converter VAGND 79 – Reference ground for the A/D converter P7.0 - P7.7 87 - 80 Port 7 is an 8-bit unidirectional input port. Port pins can be used for digital input, if voltage levels meet the specified input high/low voltages, and for the lower 8-bit of the multiplexed analog inputs of the A/D converter, simultaneously. P7.0 - P7.7 AIN0 - AIN7 analog input 8 - 14 *) I = Input O = Output Table 2 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function P-MQFP-100 |
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