P89LPC9331FDH datasheet(44/94 Pages) NXP

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P89LPC9331_9341_9351_9361

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Product data sheet

Rev. 5 — 10 January 2011

44 of 94

NXP Semiconductors

P89LPC9331/9341/9351/9361

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

PCLK/16.

7.22.9 CCU interrupts

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

7.23 UART

The P89LPC9331/9341/9351/9361 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 P89LPC9331/9341/9351/9361 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 12. 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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