HCS08 datasheet(243/374 Pages) NXP

243 / 374 page

Serial Peripheral Interface (S08SPI16V1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

243

Figure 15-2. SPI Module Quick Start

MSTR

CPOL

CPHA

SSOE

LSBFE

MODFEN

BIDIROE

SPIMODE

SPISWAI

SPC0

SPMIE

Additional configuration options.

SPPR0

SPR2

SPR1

SPR0

SPPR2

SPPR1

Baud rate = (BUSCLK/SPPR[2:0])/SPR2[2:0]

Bit 15

Bit 7

Module Initialization (Slave):

Write:

SPIxC1

to configure

interrupts, set primary SPI options, slave mode select, and

system enable.

Write:

SPIxC2

to configure

optional SPI features, hardware match interrupt enable,

and 8- or 16-bit data transmission length

Write:

SPIxMH:SPIxML

to set

hardware compare value that triggers SPMF (optional)

when value in receive data buffer equals this value.

Module Initialization (Master):

Write:

SPIxC1

to configure

interrupts, set primary SPI options, master mode select,

and system enable.

Write:

SPIxC2

to configure

optional SPI features, hardware match interrupt enable,

and 8- or 16-bit data transmission length

Write:

SPIxBR

to set

baud rate

Write:

SPIxMH:SPIxML

to set

hardware compare value that triggers SPMF (optional)

when value in receive data buffer equals this value.

Module Use:

After SPI master initiates transfer by checking that SPTEF = 1 and then writing data to SPIDH/L:

Wait for SPRF, then read from SPIDH/L

Wait for SPTEF, then write to SPIDH/L

Data transmissions can be 8- or 16-bits long, and mode fault detection can be enabled for master mode in cases where

more than one SPI device might become a master at the same time. Also, some applications may utilize the receive data

buffer hardware match feature to trigger specific actions, such as when command data can be sent through the SPI or to

indicate the end of an SPI transmission.

SPIxC1

SPIxC2

SPIxBR

SPIxDH

SPIxDL

SPIE

SPE

SPTIE

Module/interrupt enables and configuration

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SPIxMH

Hardware Match Value

Bit 15

Bit 7

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

MODF

SPTEF

SPIxS

SPRF

SPMF

SPIxML

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