P89LPC9408 datasheet(9/69 Pages) PHILIPS

9 / 69 page

P89LPC9408_1

Product data sheet

Rev. 01 — 16 December 2005

9 of 69

Philips Semiconductors

P89LPC9408

8-bit two-clock 80C51 core with 32 segment

× 4 LCD driver, 10-bit ADC

[1]

Input/output for P1.0 to P1.4, P1.6, P1.7. Input for P1.5.

P2.5/SPICLK

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 7.13.1 “Port

conﬁgurations” and Table 12 “Static electrical characteristics” for details.

All pins have Schmitt triggered inputs.

Port 3 also provides various special functions as described below:

P3.0/XTAL2/

CLKOUT

I/O

P3.0 — Port 3 bit 0.

XTAL2 — Output from the oscillator ampliﬁer (when a crystal oscillator option is

selected via the ﬂash conﬁguration.

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.

P3.1/XTAL1

I/O

P3.1 — Port 3 bit 1.

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 RTC/system timer.

SDA_LCD

I/O

SDA LCD — I2C-bus data signal for the LCD controller.

SCL_LCD

SCL LCD — I2C-bus clock signal for the LCD controller.

BP0 to BP3

27 to 30

BP0 to BP3: LCD backplane outputs.

S0 to S31

31 to 62

S0 to S31: LCD segment outputs

VSS

Ground: 0 V reference.

VDD

Power supply: This is the power supply voltage for normal operation as well as Idle

and Power-down modes.

VLCD

LCD power supply: LCD supply voltage.

Table 3:

Pin description …continued

Symbol

Type Description

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