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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P89LPC904FD датащи(PDF) 6 Page - NXP Semiconductors |
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P89LPC904FD датащи(HTML) 6 Page - NXP Semiconductors |
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6 / 41 page  Philips Semiconductors P89LPC904 8-bit microcontrollers with two-clock accelerated 80C51 core Preliminary data Rev. 02 — 25 June 2004 6 of 41 9397 750 13521 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. P1.0 to P1.5 3, 4, 5 Port 1: Port 1 is an I/O port with a user-configurable output type. During reset Port 1 latches are configured in the input only mode with the internal pull-up disabled. The operation of the configurable Port 1 pins as inputs and outputs depends upon the port configuration selected. Each of the configurable port pins are programmed independently. Refer to Section 8.13.1 “Port configurations” and Table 8 “DC electrical characteristics” for details. P1.5 is input only. All pins have Schmitt triggered inputs. Port 1 also provides various special functions as described below: 5 I/O P1.0 — Port 1 bit 0. O TxD — Serial port transmitter data. 3 I/O P1.1 — Port 1 bit 1. I RxD — Serial port receiver data. 4I P1.5 — Port 1 bit 5 (input only). I RST — External Reset input during Power-on or if selected via UCFG1. When functioning as a reset input a LOW on this pin resets the microcontroller, causing I/O ports and peripherals to take on their default states, and the processor begins execution at address 0. Also used during a power-on sequence to force In-System Programming mode. VSS 8I Ground: 0 V reference. VDD 1I Power Supply: This is the power supply voltage for normal operation as well as Idle and Power-down modes. Table 3: P89LPC904 pin description…continued Symbol Pin Type Description |
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