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P80CL580 Datasheet(PDF) 9 Page - NXP Semiconductors |
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P80CL580 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 80 page  1997 Mar 14 9 Philips Semiconductors Product specification Low voltage 8-bit microcontrollers with UART, I2C-bus and ADC P80CL580; P83CL580 P0.0 to P0.7 37 to 44 37 to 44 • Port 0: 8-bit open-drain bidirectional I/O port. As an open-drain output port it can sink 8 LS TTL loads. Port 0 pins that have logic 1s written to them float, and in that state will function as high impedance inputs. • Low-order addressing: Port 0 is also the multiplexed low-order address and data bus during access to external memory. The strong internal pull-ups are used while emitting logic 1s within the low order address. P2.0 to P2.7 55 to 53, 49 to 45 56 to 54, 49 to 45 • Port 2: 8-bit bidirectional I/O port with internal pull-ups. Same characteristics as Port 4. • High-order addressing: Port 2 emits the high-order address byte during accesses to external memory that use 16-bit addresses (MOVX @DPTR). In this application it uses the strong internal pull-ups when emitting logic 1s. During accesses to external memory that use 8-bit addresses (MOVX @Ri), Port 2 emits the contents of the P2 Special Function Register. EA 50 51 External Access. When EA is held HIGH the CPU executes out of internal Program Memory (unless the program counter exceeds 17FFH). Holding EA LOW forces the CPU to execute out of external memory regardless of the value of the Program Counter. ALE 51 52 Address Latch Enable. Output pulse for latching the low byte of the address during access to external memory. ALE is emitted at a constant rate of 1 ⁄6 × fosc, and may be used for external timing or clocking purposes (assuming MOVX instructions are not used). PSEN 52 53 Program Store Enable. Output read strobe to external Program Memory. When executing code out of external Program Memory, PSEN is activated twice each machine cycle. However, during each access to external Data Memory two PSEN activations are skipped. VDD 56 57 Power supply. n.c. − 3, 9, 17, 18, 35, 36, 50 and 58 Not connected. SYMBOL PIN DESCRIPTION VSO56 QFP64 |
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