MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 615

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

19.4
The SPI module allows a duplex, synchronous, serial communication between the MCU and peripheral
devices. Software can poll the SPI status flags or SPI operation can be interrupt driven.
The SPI system is enabled by setting the SPI enable (SPE) bit in SPI control register 1. While SPE is set,
the four associated SPI port pins are dedicated to the SPI function as:
Freescale Semiconductor
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This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
Receive Shift Register
Receive Shift Register
Slave select (SS)
Serial clock (SCK)
Master out/slave in (MOSI)
Master in/slave out (MISO)
SPI Data Register
SPI Data Register
Functional Description
SPIF
SPIF
Data A Received
Data A Received
Figure 19-10. Reception with SPIF serviced too late
Figure 19-9. Reception with SPIF serviced in Time
= Unspecified
= Unspecified
MC9S12G Family Reference Manual, Rev.1.01
Data A
Data A
Data A
Data A
= Reception in progress
= Reception in progress
Data B Received
Data B Received
Data B
Data B
SPIF Serviced
Data B Lost
SPIF Serviced
Data B
Serial Peripheral Interface (S12SPIV5)
Data C Received
Data C Received
Data C
Data C
Data C
Data C
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