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SAB-C515C-8RM Datasheet(PDF) 11 Page - Siemens Semiconductor Group |
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SAB-C515C-8RM Datasheet(HTML) 11 Page - Siemens Semiconductor Group |
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11 / 69 page  Semiconductor Group 11 1997-07-01 C515C PSEN 47 O The Program Store Enable output is a control signal that enables the external program memory to the bus during external fetch operations. It is activated every six oscillator periods, except during external data memory accesses. The signal remains high during internal program execution. ALE 48 O The Address Latch enable output is used for latching the address into external memory during normal operation. It is activated every six oscillator periods, except during an external data memory access. ALE can be switched off when the program is executed internally. EA 49 I External Access Enable When held high, the C515C executes instructions always from the internal ROM. When held low, the C515C fetches all instructions from external program memory. 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 C515C. 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. 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. *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function P-MQFP-80 |
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