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 9 of 94
NXP Semiconductors
P89LPC9331/9341/9351/9361
8-bit microcontroller with accelerated two-clock 80C51 core
P0.6/CMP1/KBI6 20 I/O P0.6 — Port 0 bit 6. High current source.
O CMP1 — Comparator 1 output.
I KBI6 — Keyboard input 6.
P0.7/T1/KBI7 19 I/O P0.7 — Port 0 bit 7. High current source.
I/O T1 — Timer/counter 1 external count input or overflow output.
I KBI7 — Keyboard input 7.
P1.0 to P1.7 I/O, I
[1]
Port 1: Port 1 is an 8-bit I/O port with a user-configurable output type, except for
three pins as noted below. 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 7.16.1 “
Port configurations” and Table 12 “Static characteristics” for
details. P1.2 to P1.3 are open drain when used as outputs. P1.5 is input only.
All pins have Schmitt trigger inputs.
Port 1 also provides various special functions as described below:
P1.0/TXD 18 I/O P1.0 — Port 1 bit 0.
O TXD — Transmitter output for serial port.
P1.1/RXD 17 I/O P1.1 — Port 1 bit 1.
I RXD — Receiver input for serial port.
P1.2/T0/SCL 12 I/O P1.2 — Port 1 bit 2 (open-drain when used as output).
I/O T0 — Timer/counter 0 external count input or overflow output (open-drain when
used as output).
I/O SCL — I
2
C-bus serial clock input/output.
P1.3/INT0
/SDA 11 I/O P1.3 — Port 1 bit 3 (open-drain when used as output).
I INT0
— External interrupt 0 input.
I/O SDA — I
2
C-bus serial data input/output.
P1.4/INT1
10 I/O P1.4 — Port 1 bit 4. High current source.
I INT1
— External interrupt 1 input.
P1.5/RST
6IP1.5 — 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 ISP mode.
P1.6/OCB 5 I/O P1.6 — Port 1 bit 6. High current source.
O OCB — Output Compare B. (P89LPC9351/9361)
P1.7/OCC/AD00 4 I/O P1.7 — Port 1 bit 7. High current source.
O OCC — Output Compare C. (P89LPC9351/9361)
I AD00 — ADC0 channel 0 analog input.
Table 3. Pin description
…continued
Symbol Pin Type Description
PLCC28,
TSSOP28
