P89LPC932BA datasheet(35/60 Pages) PHILIPS

35 / 60 page

Philips Semiconductors

P89LPC932

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

Product data

Rev. 04 — 06 January 2004

35 of 60

9397 750 12379

8.21 Serial Peripheral Interface (SPI)

The P89LPC932 provides another high-speed serial communication interface—the

SPI interface. SPI is a full-duplex, high-speed, synchronous communication bus with

two operation modes: Master mode and Slave mode. Up to 3 Mbit/s can be

supported in either Master or Slave mode. It has a Transfer Completion Flag and

Write Collision Flag Protection.

The SPI interface has four pins: SPICLK, MOSI, MISO and SS:

• SPICLK, MOSI and MISO are typically tied together between two or more SPI

devices. Data ﬂows from master to slave on MOSI (Master Out Slave In) pin and

ﬂows from slave to master on MISO (Master In Slave Out) pin. The SPICLK signal

is output in the master mode and is input in the slave mode. If the SPI system is

disabled, i.e., SPEN (SPCTL.6) = 0 (reset value), these pins are conﬁgured for port

functions.

• SS is the optional slave select pin. In a typical conﬁguration, an SPI master asserts

one of its port pins to select one SPI device as the current slave. An SPI slave

device uses its SS pin to determine whether it is selected.

Typical connections are shown in Figures 16 through 18.

Fig 15. SPI block diagram.

002aaa497

CPU clock

DIVIDER

BY 4, 16, 64, 128

SELECT

CLOCK LOGIC

SPI CONTROL REGISTER

READ DATA BUFFER

8-BIT SHIFT REGISTER

SPI CONTROL

SPI STATUS REGISTER

SPI clock (master)

MISO

P2.3

MOSI

P2.2

SPICLK

P2.5

P2.4

SPI

interrupt

request

internal

data

bus

MSTR

SPEN

clock

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