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P83CL781HFH Datasheet(PDF) 10 Page - NXP Semiconductors |
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P83CL781HFH Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 76 page 1997 Mar 14 10 Philips Semiconductors Product specification Low voltage 8-bit microcontrollers with UART and I2C-bus P83CL781; P83CL782 PSEN 29 26 Program Store Enable: 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. ALE 30 27 Address Latch Enable: Latches the low byte of the address during accesses to external memory. It is activated every six oscillator periods and may be used for external timing or clocking purposes. n.c. − 28 Not connected. EA 31 29 External Access: When EA is held HIGH, the CPU executes out of the internal Program Memory (unless the Program Counter exceeds 3FFFH). When EA is held LOW, the CPU executes out of external Program Memory regardless of the value of the program counter. P0.7/AD7 32 30 • Port 0: 8-bit open-drain bidirectional I/O port (P0.7 to P0.0). As an open-drain output port it can sink/source 8 LS TTL loads. Port 0 pins that have logic 1s written to them float, and in this state will function as high-impedance inputs. • Low-order addressing: AD7 to AD0 provide the multiplexed low-order address and data bus during accesses to external memory. In this application the pins use the strong internal pull-ups when emitting logic 1s. P0.6/AD6 33 31 P0.5/AD5 34 32 P0.4/AD4 35 33 P0.3/AD3 36 34 P0.2/AD2 37 35 P0.1/AD1 38 36 P0.0/AD0 39 37 VDD 40 38 Power supply. n.c. − 39 Not connected. SYMBOL PIN DESCRIPTION DIP40 QFP44 |
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