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C515A_9708 Datasheet(PDF) 10 Page - Siemens Semiconductor Group |
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C515A_9708 Datasheet(HTML) 10 Page - Siemens Semiconductor Group |
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10 / 182 page  Semiconductor Group 1-5 1997-08-01 Introduction C515A 1.2 Pin Definitions and Functions This section describes all external signals of the C515A with its function. Table 1-1 Pin Definitions and Functions Symbol Pin Number (P-MQFP-80) I/O*) Function P4.0-P4.7 72-74, 76-80 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. P4 also contains the external A/D converter control pin. The output latch corresponding to a secondary function must be programmed to a one (1) for that function to operate. The secondary function is assigned to port 4 as follows : P4.0 / ADST external A/D converter start pin PE/SWD 75 I Power Saving Mode Enable / Start Watchdog Timer A low level on this pin allows the software to enter the power down, idle, and slow down mode. In case the low level is also seen during reset, the watchdog timer function is off on default. Use of the software controlled power saving modes is blocked when this pin is held on 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. Note : If PE/SWD is low and VAREF is low the oscillator watchdog is disabled (testmode) ! RESET 1I RESET A low level on this pin for the duration of two machine cycles while the oscillator is running resets the C515A. A small internal pullup resistor permits power-on reset using only a capacitor connected to VSS . VAREF 3 – Reference Voltage for the A/D converter VAGND 4 – Reference Ground for the A/D converter *) I = Input O = Output |
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