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SAB-C517A-4RM Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
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SAB-C517A-4RM Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
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9 / 67 page  Semiconductor Group 9 1997-10-01 C517A EA 24 I External Access Enable When held high, the C517A executes instructions from the internal ROM as long as the PC is less than 8000H. When held low, the C517A fetches all instructions from external program memory. For the C517A-L this pin must be tied low. 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 1's written to them float, and in that state can be used as high-impedance inputs. Port 0 is also the multiplexed low-order address and data bus during accesses to external program and data memory. In this application it uses strong internal pullup resistors when issuing 1's. Port 0 also outputs the code bytes during program verification in the C517A. External pullup resistors are required during program verification. 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 C517A. A low level for a longer period will force the part into hardware 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 a quasi-bidirectional I/O port with internal pull-up resistors. Port 5 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 5 pins being externally pulled low will source current (IIL, in the DC characteristics) because of the internal pull-up resistors. This port also serves the alternate function “Concurrent Compare” and “Set/Reset Compare”. The secondary functions are assigned to the port 5 pins as follows: CCM0 to CCM7 P5.0 to P5.7: concurrent compare or Set/Reset lines *) 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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