SPMCK16Z4MPV16 datasheet(211/500 Pages) FREESCALE

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M68HC16 Z SERIES

QUEUED SERIAL MODULE

USER’S MANUAL

9-1

SECTION 9

QUEUED SERIAL MODULE

This section is an overview of the queued serial module (QSM). Refer to the

QSM Ref-

erence Manual (QSMRM/AD) for complete information about the QSM.

9.1 General

The QSM contains two serial interfaces: the queued serial peripheral interface (QSPI)

and the serial communication interface (SCI). Figure 9-1 is a block diagram of the

QSM. The QSM is present on the MC68HC16Z1, MC68CK16Z1, MC68CM16Z1,

MC68HC16Z2, and MC68HC16Z3 microcontrollers.

Figure 9-1 QSM Block Diagram

The QSPI provides peripheral expansion or interprocessor communication through a

full-duplex, synchronous, three-line bus. Four programmable peripheral chip-selects

can select up to sixteen peripheral devices by using an external 1 of 16 line selector.

A self-contained RAM queue allows up to sixteen serial transfers of eight to sixteen

bits each or continuous transmission of up to a 256-bit data stream without CPU16 in-

tervention. A special wrap-around mode supports continuous transmission/reception

of data.

QSPI

INTERFACE

LOGIC

SCI

MISO/PQS0

MOSI/PQS1

SCK/PQS2

PCS0/SS/PQS3

PCS1/PQS4

PCS2/PQS5

PCS3/PQS6

TXD/PQS7

RXD

QSM BLOCK

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SPMCK16Z4MPV16 Datasheet(PDF) 211 Page - Freescale Semiconductor, Inc