Datasheet

Serial Peripheral Interface (SPI)
MC9S12DP256 — Revision 1.1
Serial Peripheral Interface (SPI)
Signal Descriptions
Table 74 summarizes the Serial Peripheral Interface pad interface signal
characteristics.
Table 74 SPI Pad Interface Signal Characteristics
Signal Name Mnemonic
Input/
Output
Active
State
Reset
State
Function
Input Signals
Slave Data in spi_mosi_ind Input — — Input mosi port from SPI Pads
Master Data in spi_miso_ind Input — — Input miso port from SPI Pads
Slave Select in spi_ss_ind Input Low —
Input slave select port from SPI
Pads
Serial Clock in spi_sck_ind Input
High
Low
— Input serial clock from SPI Pads
Control Signals
MOSI port enable spi_mosi_port_en Output High
Indicates that the SPI is the
master of the pad.
MISO port enable spi_miso_port_en Output High
Indicates that the SPI is the
master of the pad.
SS
port enable spi_ss_port_en Output High
Indicates that the SPI is the
master of the pad.
SCK port enable spi_sck_port_en Output High
Indicates that the SPI is the
master of the pad.
MOSI Output enable spi_mosi_obe Output High
Indicates that the output buffer
should be turned on, so the SPI
pin value is driving the wire.
MISO Output enable spi_miso_obe Output High
Indicates that the output buffer
should be turned on, so the SPI
pin value is driving the wire.
SS
Output enable spi_ss_obe Output High
Indicates that the output buffer
should be turned on, so the SPI
pin value is driving the wire.
SCK Output enable spi_sck_obe Output High
Indicates that the output buffer
should be turned on, so the SPI
pin value is driving the wire.
Output Signals
Master Data out spi_mosi_do Output — — Output mosi port to SPI Pads
Slave Data out spi_miso_do Output — — Output miso port to SPI Pads
Slave Select out spi_ss_do Output — — Output ss port to SPI Pads
Serial Clock out spi_sck_do Output — — Output sck port to SPI Pads
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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