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SAB-C515-1R24M Datasheet(PDF) 11 Page - Infineon Technologies AG |
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SAB-C515-1R24M Datasheet(HTML) 11 Page - Infineon Technologies AG |
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11 / 55 page  Semiconductor Group 11 1997-08-01 C515 EA 49 I External Access Enable When held high, the C515 executes instructions from the internal ROM (C515-1R) as long as the program counter is less than 2000H. When held low, the C515 fetches all instructions from ext. program memory. For the C515-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 C515-1R. External pullup resistors are required during program verification. P5.ß-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. P4.0-P4.7 72-74, 76-80 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 75 I Power saving mode enable A low level on this pin allows the software to enter the power saving modes (idle mode and power down mode). When PE is held at high level it is impossible to enter the power saving modes. When left unconnected this pin is pulled high by a weak internal pull-up resistor. *) 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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