MC68HC05P9A Datasheet, PDF (109/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Data Movement
Freescale Semiconductor, Inc.
SIOP
Operation
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 62 shows how the
master and slave exchange the contents of their data registers.
SDO
SDO
SIOP SHIFT REGISTER
SDI
SIOP SHIFT REGISTER
SIOP IN
MASTER MODE
SCK
SDI
SIOP IN
SLAVE MODE
SCK
Figure 62. Master/Slave SIOP Shift Register Operation
11-mc68hc05p9a
MOTOROLA
SIOP
109
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