XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 304
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
1.XC908AS60ACFU.pdf
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Serial Peripheral Interface (SPI)
19.10 Resetting the SPI
Technical Data
304
Any system reset completely resets the SPI. Partial reset occurs
whenever the SPI enable bit (SPE) is low. Whenever SPE is low, the
following occurs:
The following additional items are reset only by a system reset:
By not resetting the control bits when SPE is low, the user can clear SPE
between transmissions without having to reset all control bits when SPE
is set back to high for the next transmission.
By not resetting the SPRF, OVRF, and MODF flags, the user can still
service these interrupts after the SPI has been disabled. The user can
disable the SPI by writing 0 to the SPE bit. The SPI also can be disabled
by a mode fault occurring in an SPI that was configured as a master with
the MODFEN bit set.
•
•
•
•
•
•
•
•
The SPTE flag is set.
Any transmission currently in progress is aborted.
The shift register is cleared.
The SPI state counter is cleared, making it ready for a new
complete transmission.
All the SPI port logic is defaulted back to being general-purpose
I/O.
All control bits in the SPCR register
All control bits in the SPSCR register (MODFEN, ERRIE, SPR1,
and SPR0)
The status flags SPRF, OVRF, and MODF
Serial Peripheral Interface (SPI)
MC68HC908AZ60A — Rev 2.0
MOTOROLA
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