MC68HC705P9CS datasheet(123/160 Pages) FREESCALE

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Serial Input/Output Port (SIOP)

Timing

MC68HC705P9 — Rev. 4.0

Technical Data

MOTOROLA

Serial Input/Output Port (SIOP)

123

10.4.2 Data Movement

Connecting the SIOP data register of a master MCU with the SIOP of a

slave MCU forms a 16-bit circular shift register. During an SIOP transfer,

the master shifts out the contents of its SIOP data register on its

PB5/SDO pin. At the same time, the slave MCU shifts out the contents

of its SIOP data register on its PB5/SDO pin. Figure 10-4 shows how the

master and slave exchange the contents of their data registers.

Figure 10-4. Master/Slave SIOP Shift Register Operation

10.5 Timing

Figure 10-5. SIOP Timing

SIOP SHIFT REGISTER

SDO

SDI

SIOP SHIFT REGISTER

SDI

SDO

SCK

SIOP IN

SLAVE MODE

SIOP IN

MASTER MODE

MSB

tSCK

tSCKL

BIT 1

MSB

VALID

DATA

LSB

tHO

SCK

SDO

SDI

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