P89LPC938 NXP Semiconductors, P89LPC938 Datasheet - Page 32

• Manufacturer Part Number: P89LPC938
• Description: The P89LPC938 is a single-chip microcontroller, available in low cost packages, based ona high performance processor architecture that executes instructions in two to four clocks,six times the rate of standard 80C51 devices
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 14051
Product data sheet
Fig 11. Capture/Compare Unit interrupts.
TOCIE2A (TICR2.3)
TOCIE2B (TICR2.4)
TOCIE2C (TICR2.5)
TOCIE2D (TICR2.6)
TOCF2C (TIFR2.5)
TOCF2D (TIFR2.6)
TICIE2A (TICR2.0)
TICIE2B (TICR2.1)
TOCF2A (TIFR2.3)
TOCF2B (TIFR2.4)
TICF2A (TIFR2.0)
TICF2B (TIFR2.1)
7.19.9 CCU interrupts
7.20.1 Mode 0
7.20.2 Mode 1
TOIE2 (TICR2.7)
TOIF2 (TIFR2.7)
ECCU (IEN1.4)
7.20 UART
EA (IEN0.7)
There are seven interrupt sources on the CCU which share a common interrupt vector.
The P89LPC938 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
P89LPC938 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
4 modes: shift register, 8-bit UART, 9-bit UART, and CPU clock/32 or CPU clock/16.
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
frequency.
10 bits are transmitted (through TXD) or received (through RXD): a start bit (logic 0),
8 data bits (LSB first), and a stop bit (logic 1). When data is received, the stop bit is stored
in RB8 in Special Function Register SCON. The baud rate is variable and is determined
by the Timer 1 overflow rate or the Baud Rate Generator (described in
“Baud rate generator and
Rev. 01 — 25 February 2005
selection”).
ENCODER
PRIORITY
8-bit microcontroller with 10-bit A/D converter
interrupt
sources
other
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
1
16
of the CPU clock
002aaa896
P89LPC938
interrupt to
CPU
ENCINT.0
ENCINT.1
ENCINT.2
Section 7.20.5
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