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SAB-C515A-4RM Datasheet(PDF) 11 Page - Siemens Semiconductor Group |
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SAB-C515A-4RM Datasheet(HTML) 11 Page - Siemens Semiconductor Group |
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11 / 58 page  Semiconductor Group 11 1997-10-01 C515A EA 49 I External Access Enable When held high, the C515A executes instructions from the internal ROM (C515A-4R) as long as the PC is less than 8000H. When held low, the C515A fetches all instructions from external program memory. For the C515A-L this pin must be tied low. P0.0-P0.7 52-59 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 C515A-4R. External pullup resistors are required during program verification. P5.0-P5.7 67-60 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. HWPD 69 I Hardware Power Down A low level on this pin for the duration of one machine cycle while the oscillator is running resets the C515A. A low level for a longer period will force the C515A into Hardware Power Down Mode with the pins floating. N.C. 2, 13, 14, 23, 46, 50, 51, 68, 70, 71 – Not connected These pins of the P-MQFP-80 package need not be connected. *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number (P-MQFP-80) I/O*) Function |
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