P89LPC9321 datasheet(35/70 Pages) NXP

35 / 70 page

P89LPC9321_1

Product data sheet

Rev. 01 — 9 December 2008

35 of 70

NXP Semiconductors

P89LPC9321

8-bit microcontroller with accelerated two-clock 80C51 core

Since N ranges from 0 to 15, the CCLK frequency can be in the range of PCLK to

PCLK16.

7.22.9 CCU interrupts

There are seven interrupt sources on the CCU which share a common interrupt vector.

7.23 UART

The P89LPC9321 has an enhanced UART that is compatible with the conventional 80C51

UART except that Timer 2 overﬂow cannot be used as a baud rate source. The

P89LPC9321 does include an independent baud rate generator. The baud rate can be

selected from the oscillator (divided by a constant), Timer 1 overﬂow, or the independent

baud rate generator. In addition to the baud rate generation, enhancements over the

standard 80C51 UART include Framing Error detection, automatic address recognition,

selectable double buffering and several interrupt options. The UART can be operated in

four modes: shift register, 8-bit UART, 9-bit UART, and CPU clock/32 or CPU clock/16.

7.23.1 Mode 0

Serial data enters and exits through RXD. TXD outputs the shift clock. 8 bits are

transmitted or received, LSB ﬁrst. The baud rate is ﬁxed at 1

⁄

16 of the CPU clock

frequency.

Fig 11. Capture/compare unit interrupts

002aaa896

interrupt to

CPU

TOIE2 (TICR2.7)

TOIF2 (TIFR2.7)

TICIE2A (TICR2.0)

TICF2A (TIFR2.0)

TICIE2B (TICR2.1)

TICF2B (TIFR2.1)

TOCIE2A (TICR2.3)

TOCF2A (TIFR2.3)

TOCIE2B (TICR2.4)

TOCF2B (TIFR2.4)

TOCIE2C (TICR2.5)

TOCF2C (TIFR2.5)

TOCIE2D (TICR2.6)

TOCF2D (TIFR2.6)

EA (IEN0.7)

ECCU (IEN1.4)

PRIORITY

ENCODER

other

interrupt

sources

ENCINT.0

ENCINT.1

ENCINT.2

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