p89lpc935fdh NXP Semiconductors, p89lpc935fdh Datasheet - Page 8

• Manufacturer Part Number: p89lpc935fdh
• Description: 8-bit Microcontroller With Accelerated Two-clock 80c51 Core 4 Kb/8 Kb 3 V Byte-erasable Flash With 8-bit A/d Converters
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 4:
9397 750 15113
Product data sheet
Symbol
P1.0 to P1.7
P1.0/TXD
P1.1/RXD
P1.2/T0/SCL 12
P1.3/INT0/
SDA
P1.4/INT1
P1.5/RST
P1.6/OCB
P1.7/OCC/
AD00
Pin description
Pin
TSSOP28,
PLCC28
18
17
11
10
6
5
4
HVQFN28
14
13
8
7
6
2
1
28
…continued
Type
I/O, I
I/O
O
I/O
I
I/O
I/O
I/O
I/O
I
I/O
I
I
I
I
I/O
O
I/O
O
I
[1]
Description
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
configurations”
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 — Port 1 bit 0.
TXD — Transmitter output for the serial port.
P1.1 — Port 1 bit 1.
RXD — Receiver input for the serial port.
P1.2 — Port 1 bit 2 (open-drain when used as output).
T0 — Timer/counter 0 external count input or overflow output (open-drain
when used as output).
SCL — I
P1.3 — Port 1 bit 3 (open-drain when used as output).
INT0 — External interrupt 0 input.
SDA — I
P1.4 — Port 1 bit 4.
INT1 — External interrupt 1 input.t
P1.5 — Port 1 bit 5 (input only).
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. When using an oscillator
frequency above 12 MHz, the reset input function of P1.5 must be
enabled. An external circuit is required to hold the device in reset at
power-up until V
power is removed V
operating voltage. When using an oscillator frequency above
12 MHz, in some applications, an external brownout detect circuit
may be required to hold the device in reset when V
minimum specified operating voltage.
P1.6 — Port 1 bit 6.
OCB — Output Compare B. (P89LPC935/936)
P1.7 — Port 1 bit 7.
OCC — Output Compare C. (P89LPC935/936)
AD00 — ADC0 channel 0 analog input. (P89LPC935/936)
Rev. 06 — 20 June 2005
8-bit microcontroller with accelerated two-clock 80C51 core
2
2
C serial clock input/output.
C serial data input/output.
and
DD
P89LPC933/934/935/936
Table 11 “Static characteristics”
has reached its specified level. When system
DD
will fall below the minimum specified
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Section 8.13.1 “Port
for details. P1.2 and
DD
falls below the
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