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P89LPC921FDH Datasheet(PDF) 6 Page - NXP Semiconductors |
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P89LPC921FDH Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 45 page Philips Semiconductors P89LPC920/921/922 8-bit microcontrollers with two-clock 80C51 core Product data Rev. 06 — 21 November 2003 6 of 45 9397 750 12285 © Koninklijke Philips Electronics N.V. 2003. All rights reserved. 5.2 Pin description Table 3: Pin description Symbol Pin Type Description P0.0 - P0.7 1, 20, 19, 18, 17, 16, 14, 13 I/O Port 0: Port 0 is an 8-bit I/O port with a user-configurable output type. During reset Port 0 latches are configured in the input only mode with the internal pull-up disabled. The operation of Port 0 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to Section 8.12.1 “Port configurations” and Table 8 “DC electrical characteristics” for details. The Keypad Interrupt feature operates with Port 0 pins. All pins have Schmitt triggered inputs. Port 0 also provides various special functions as described below: 1 I/O P0.0 — Port 0 bit 0. O CMP2 — Comparator 2 output. I KBI0 — Keyboard input 0. 20 I/O P0.1 — Port 0 bit 1. I CIN2B — Comparator 2 positive input B. I KBI1 — Keyboard input 1. 19 I/O P0.2 — Port 0 bit 2. I CIN2A — Comparator 2 positive input A. I KBI2 — Keyboard input 2. 18 I/O P0.3 — Port 0 bit 3. I CIN1B — Comparator 1 positive input B. I KBI3 — Keyboard input 3. 17 I/O P0.4 — Port 0 bit 4. I CIN1A — Comparator 1 positive input A. I KBI4 — Keyboard input 4. 16 I/O P0.5 — Port 0 bit 5. I CMPREF — Comparator reference (negative) input. I KBI5 — Keyboard input 5. 14 I/O P0.6 — Port 0 bit 6. O CMP1 — Comparator 1 output. I KBI6 — Keyboard input 6. 13 I/O P0.7 — Port 0 bit 7. I/O T1 — Timer/counter 1 external count input or overflow output. I KBI7 — Keyboard input 7. |
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