SPMCK16Z4MPV20 datasheet(244/500 Pages) FREESCALE

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MULTICHANNEL COMMUNICATION INTERFACE

M68HC16 Z SERIES

10-4

USER’S MANUAL

Select a value for INTV so that each MCCI interrupt vector corresponds to one of the

user-defined vectors ($40–$FF). Refer to the

CPU16 Reference Manual (CPU16RM/

AD) for additional information on interrupt vectors.

10.2.2 Pin Control and General-Purpose I/O

The eight pins used by the SPI and SCI subsystems have alternate functions as gen-

eral-purpose I/O pins. Configuring the MCCI submodule includes programming each

pin for either general-purpose I/O or its serial interface function. In either function,

each pin must also be programmed as input or output.

The MCCI data direction register (MDDR) assigns each MCCI pin as either input or

output. The MCCI pin assignment register (MPAR) assigns the MOSI, MISO, and SS

pins as either SPI pins or general-purpose I/O. (The fourth pin, SCK, is automatically

assigned to the SPI whenever the SPI is enabled, for example, when the SPE bit in

the SPI control register is set.) The receiver enable (RE) and transmitter enable (TE)

bits in the SCI control registers (SCCR0A, SCCR0B) automatically assign the associ-

ated pin as an SCI pin when set or general-purpose I/O when cleared. Table 10-2

summarizes how pin function and direction are assigned.

10.3 Serial Peripheral Interface (SPI)

The SPI submodule communicates with external peripherals and other MCUs via a

synchronous serial bus. The SPI is fully compatible with the serial peripheral interface

systems found on othe Freescale devices, such as the M68HC11 and M68HC05 fam-

ilies. The SPI can perform full duplex three-wire or half duplex two-wire transfers. Se-

rial transfer of eight or sixteen bits can begin with the MSB or LSB. The system can be

configured as a master or slave device.

Figure 10-2 shows a block diagram of the SPI.

Table 10-2 Pin Assignments

Function Assigned By

Direction Assigned By

TXDA/PMC7

TE bit in SCCR0A

MMDR7

RXDA/PMC6

RE bit in SCCR0A

MMDR6

TXDB/PMC5

TE bit in SCCR0B

MMDR5

RXDB/PMC4

RE bit in SCCR0B

MMDR4

SS/PMC3

SS bit in MPAR

MMDR3

SCK/PMC2

SPE bit in SPCR

MMDR2

MOSI/PMC1

MOSI bit in MPAR

MMDR1

MISO/PMC0

MISO bit in MPAR

MMDR0

Freescale Semiconductor, Inc.

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SPMCK16Z4MPV20 Datasheet(PDF) 244 Page - Freescale Semiconductor, Inc

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