MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 422

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Serial Peripheral Interface Module (SPI)
18.8.7 Error Conditions
18.8.7.1 Write Collision Error
18.8.7.2 Mode Fault Error
Advance Information
422
The SPI has two error conditions:
The WCOL flag in SPISR indicates that a serial transfer was in progress
when the MCU tried to write new data to SPIDR. Valid write times are
listed below (see
and t
A write during any other time causes a WCOL error. The write is disabled
to avoid writing over the data being transmitted. WCOL does not
generate an interrupt request because the WCOL flag can be read upon
completion of the transmission that was in progress at the time of the
error.
If the SS input of a master SPI goes low, it indicates a system error in
which more than one master may be trying to drive the MOSI and SCK
lines simultaneously. This condition is not permitted in normal operation;
it sets the MODF flag in SPISR. If the SPIE bit in SPICR1 is also set,
MODF generates an interrupt request.
Configuring the SS pin as a general-purpose output or a slave-select
output disables the mode fault function.
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Freescale Semiconductor, Inc.
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):
Write collision error
Mode fault error
In master mode, a valid write is within t
In slave phase 0, a valid write within t
In slave phase 1, a valid write is within t
edge and before SS goes low), excluding the first two SPI clocks
after the last SCK edge (the beginning of t
Serial Peripheral Interface Module (SPI)
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Figure 18-11
and
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
Figure 18-12
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(when SS is high).
I
T
(when SS is high).
or t
T
for definitions of t
is an illegal write).
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(after the last SCK
MOTOROLA
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