HCS08 datasheet(260/374 Pages) NXP

260 / 374 page

Serial Peripheral Interface (S08SPI16V1)

MC9S08JM60 Series Data Sheet, Rev. 5

260

Freescale Semiconductor

The baud rate divisor equation is as follows:

The baud rate can be calculated with the following equation:

Figure 15-15. SPI Baud Rate Generation

15.4.7

Special Features

15.4.7.1

SS Output

The SS output feature automatically drives the SS pin low during transmission to select external devices

and drives it high during idle to deselect external devices. When SS output is selected, the SS output pin

is connected to the SS input pin of the external device.

The SS output is available only in master mode during normal SPI operation by asserting the SSOE and

MODFEN bits as shown in Table 15-2.

The mode fault feature is disabled while SS output is enabled.

NOTE

Care must be taken when using the SS output feature in a multi-master

system since the mode fault feature is not available for detecting system

errors between masters.

15.4.7.2

Bidirectional Mode (MOMI or SISO)

The bidirectional mode is selected when the SPC0 bit is set in SPI Control Register 2 (see Table 15-9.) In

this mode, the SPI uses only one serial data pin for the interface with external device(s). The MSTR bit

decides which pin to use. The MOSI pin becomes the serial data I/O (MOMI) pin for the master mode, and

the MISO pin becomes serial data I/O (SISO) pin for the slave mode. The MISO pin in master mode and

MOSI pin in slave mode are not used by the SPI.

BaudRateDivisor

SPPR 1

()ξ2

SPR 1

()

Baud Rate

BusClock

BaudRateDivisor

---------------------------------------------

DIVIDE BY

2, 4, 8, 16, 32, 64, 128, or 256

DIVIDE BY

1, 2, 3, 4, 5, 6, 7, or 8

PRESCALER

BAUD RATE DIVIDER

SPPR2:SPPR1:SPPR0

SPR2:SPR1:SPR0

BUS CLOCK

MASTER

SPI

BIT RATE

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