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P89LPC908 Datasheet(PDF) 9 Page - NXP Semiconductors |
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P89LPC908 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 51 page Philips Semiconductors P89LPC906/907/908 8-bit microcontrollers with two-clock 80C51 core Product data Rev. 05 — 17 December 2004 9 of 51 9397 750 14467 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. P3.0 to P3.1 I/O Port 3: Port 3 is an I/O port with a user-configurable output types. During reset Port 3 latches are configured in the input only mode with the internal pull-up disabled. The operation of port 3 pins as inputs and outputs depends upon the port configuration selected. Each port pin is configured independently. Refer to Section 8.11.1 “Port configurations” and Table 13 “DC electrical characteristics” for details. All pins have Schmitt triggered inputs. Port 3 also provides various special functions as described below: 5 I/O P3.0 — Port 3 bit 0. O XTAL2 — Output from the oscillator amplifier (when a crystal oscillator option is selected via the FLASH configuration). O CLKOUT — CPU clock divided by 2 when enabled via SFR bit (ENCLK to TRIM.6). It can be used if the CPU clock is the internal RC oscillator, Watchdog oscillator or external clock input, except when XTAL1/XTAL2 are used to generate clock source for the real time clock/system timer. 4 I/O P3.1 — Port 3 bit 1. I XTAL1 — Input to the oscillator circuit and internal clock generator circuits (when selected via the FLASH configuration). It can be a port pin if internal RC oscillator or Watchdog oscillator is used as the CPU clock source, and if XTAL1/XTAL2 are not used to generate the clock for the real time clock/system timer. VSS 2I Ground: 0 V reference. VDD 6I Power Supply: This is the power supply voltage for normal operation as well as Idle and Power-down modes. Table 3: P89LPC906 pin description…continued Symbol Pin Type Description Table 4: P89LPC907 pin description Symbol Pin Type Description P0.4 to P0.6 I/O Port 0: Port 0 is an 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 8.11.1 “Port configurations” and Table 13 “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: 8 I/O P0.4 — Port 0 bit 4. I CIN1A — Comparator positive input. I KBI4 — Keyboard input 4. 7 I/O P0.5 — Port 0 bit 5. I CMPREF — Comparator reference (negative) input. I KBI5 — Keyboard input 5. 3 I/O P0.6 — Port 0 bit 6. O CMP1 — Comparator 1 output. I KBI6 — Keyboard input 6. |
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