P89LPC9331_9341_9351_9361 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 5.1 — 20 August 2012 10 of 94
NXP Semiconductors
P89LPC9331/9341/9351/9361
8-bit microcontroller with accelerated two-clock 80C51 core
P2.0 to P2.7 I/O Port 2: Port 2 is an 8-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
7.16.1 “Port configurations” and Table 12 “Static characteristics” for details.
All pins have Schmitt trigger inputs.
Port 2 also provides various special functions as described below:
P2.0/ICB/DAC0
/AD03
1I/OP2.0 — Port 2 bit 0.
I ICB — Input Capture B. (P89LPC9351/9361)
O DAC0 — Digital-to-analog converter output.
I AD03 — ADC0 channel 3 analog input.
P2.1/OCD/AD02 2 I/O P2.1 — Port 2 bit 1.
O OCD — Output Compare D. (P89LPC9351/9361)
I AD02 — ADC0 channel 2 analog input.
P2.2/MOSI 13 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 — When configured as master, this pin is input, when configured as slave,
this pin is output.
P2.4/SS
15 I/O P2.4 — Port 2 bit 4.
I SS
— SPI Slave select.
P2.5/SPICLK 16 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.
P2.6/OCA 27 I/O P2.6 — Port 2 bit 6.
O OCA — Output Compare A. (P89LPC9351/9361)
P2.7/ICA 28 I/O P2.7 — Port 2 bit 7.
I ICA — Input Capture A. (P89LPC9351/9361)
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
7.16.1 “Port configurations” and Table 12 “Static characteristics” for details.
All pins have Schmitt trigger inputs.
Port 3 also provides various special functions as described below:
P3.0/XTAL2/
CLKOUT
9I/OP3.0 — 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 RTC/system timer.
Table 3. Pin description
…continued
Symbol Pin Type Description
PLCC28,
TSSOP28
