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P89LPC914 Datasheet(PDF) 11 Page - NXP Semiconductors |
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P89LPC914 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 66 page P89LPC912_913_914_5 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 05 — 28 September 2007 11 of 66 NXP Semiconductors P89LPC912/913/914 8-bit microcontrollers with two-clock 80C51 core P2.2 to P2.5 I/O Port 2: Port 2 is a 4-bit I/O port with a user-configurable output type. During reset Port 2 latches are configured in the input only mode with the internal pull-up disabled. The operation of Port 2 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 13 “Static characteristics” for details. All pins have Schmitt triggered inputs. Port 2 also provides various special functions as described below: P2.2/MOSI 1 I/O P2.2 — Port 2 bit 2. I/O MOSI — SPI master out slave in. When configured as master, this pin is output, when configured as slave, this pin is input. P2.3/MISO 14 I/O P2.3 — Port 2 bit 3. I/O MISO — SPI master in slave out. When configured as master, this pin is input, when configured as slave, this pin is output. P2.4/SS 9 I/O P2.4 — Port 2 bit 4. I SS — SPI Slave select. P2.5/SPICLK 2 I/O P2.5 — Port 2 bit 5. I/O SPICLK — SPI clock. When configured as master, this pin is output, when configured as slave, this pin is input. P3.0 to P3.1 I/O Port 3: Port 3 is a 2-bit I/O port with a user-configurable output type. 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 8.12.1 “Port configurations” and Table 13 “Static characteristics” for details. All pins have Schmitt triggered inputs. Port 3 also provides various special functions as described below: P3.0/XTAL2/ CLKOUT 8 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 - 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. P3.1/XTAL1 7 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 4I Ground: 0 V reference. VDD 10 I Power Supply: This is the power supply voltage for normal operation as well as Idle and Power-down modes. Table 4. P89LPC912 pin description …continued Symbol Pin Type Description |
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