XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 301
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
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19.8 Interrupts
MC68HC908AZ60A — Rev 2.0
MOTOROLA
NOTE:
bit does not clear the SPE bit or reset the SPI in any way. Software can
abort the SPI transmission by toggling the SPE bit of the slave.
A logic 1 voltage on the SS pin of a slave SPI puts the MISO pin in a high
impedance state. Also, the slave SPI ignores all incoming SPSCK
clocks, even if a transmission has begun.
To clear the MODF flag, read the SPSCR and then write to the SPCR
register. This entire clearing procedure must occur with no MODF
condition existing or else the flag will not be cleared.
Four SPI status flags can be enabled to generate CPU interrupt
requests:
The SPI transmitter interrupt enable bit (SPTIE) enables the SPTE flag
to generate transmitter CPU interrupt requests.
The SPI receiver interrupt enable bit (SPRIE) enables the SPRF bit to
generate receiver CPU interrupt, provided that the SPI is enabled
(SPE = 1).
The error interrupt enable bit (ERRIE) enables both the MODF and
OVRF flags to generate a receiver/error CPU interrupt request.
The mode fault enable bit (MODFEN) can prevent the MODF flag from
being set so that only the OVRF flag is enabled to generate
receiver/error CPU interrupt requests.
SPTE (Transmitter Empty)
SPRF (Receiver Full)
OVRF (Overflow)
MODF (Mode Fault)
Flag
Serial Peripheral Interface (SPI)
Table 19-4. SPI Interrupts
SPI Transmitter CPU Interrupt Request (SPTIE = 1)
SPI Receiver CPU Interrupt Request (SPRIE = 1)
SPI Receiver/Error Interrupt Request
SPI Receiver/Error Interrupt Request
(SPRIE = 1, ERRIE = 1)
(SPRIE = 1, ERRIE = 1, MODFEN = 1)
Request
Serial Peripheral Interface (SPI)
Technical Data
Interrupts
301
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