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SAF-C509-L Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
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SAF-C509-L Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
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9 / 74 page  C509-L Semiconductor Group 8 P0.0 – P0.7 26, 27, 30-35 I/O Port 0 is an 8-bit open-drain bidirectional I/O port. Port 0 pins that have 1s written to them float, and in that state can be used as high-impendance inputs. Port 0 is also the multiplexed low-order address and data bus during accesses to external program or data memory. In this operating mode it uses strong internal pullup resistors when issuing 1 s. P0.0 - P0.7 AD0-AD7 Address/data lines 0 - 7 HWPD 36 I Hardware Power Down A low level on this pin for the duration of one machine cycle while the oscillator is running resets the C509-L. A low level for a longer period will force the part to power down mode with the pins floating. There is no internal pullup resistor connected to this pin. P5.0 - P5.7 44-37 I/O Port 5 is an 8-bit quasi-bidirectional I/O port with internal pullup resistors. Port 5 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 5 pins being externally pulled low will source current (I IL, in the DC characteristics) because of the internal pullup resistors. Port 5 can also be switched into a bidirectional mode, in which CMOS levels are provided. In this bidirectional mode, each port 5 pin can be programmed individually as input or output. Port 5 also serves as alternate function for “Concurrent Compare” and "Set/Reset compare” functions. The output latch corresponding to a secondary function must be programmed to a one (1) for that function to operate. The secondary functions are assigned to the pins of port 5 as follows : P5.0 - P5.7 CCM0-CCM7 Concurrent Compare or Set/Reset lines 0 - 7 *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function |
Similar Part No. - SAF-C509-L |
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Similar Description - SAF-C509-L |
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