P89LPC9211FDH datasheet(11/75 Pages) NXP

11 / 75 page

P89LPC92X1

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Product data sheet

Rev. 2 — 1 December 2010

11 of 75

NXP Semiconductors

P89LPC9201/9211/922A1/9241/

8-bit microcontroller with 8-bit ADC

[1]

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

P3.0/XTAL2/

CLKOUT

7I/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.

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.

Table 3.

Pin description …continued

Symbol

Type Description

TSSOP20,

DIP20

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