MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 300
MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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Serial Peripheral Interface Module (SPI)
16.12 SPI During Break Interrupts
16.13 I/O Signals
Technical Data
300
The system integration module (SIM) controls whether status bits in
other modules can be cleared during the break state. The BCFE bit in
the SIM break flag control register (SBFCR) enables software to clear
status bits during the break state. (See
Module
To allow software to clear status bits during a break interrupt, write a
logic 1 to the BCFE bit. If a status bit is cleared during the break state, it
remains cleared when the MCU exits the break state.
To protect status bits during the break state, write a logic 0 to the BCFE
bit. With BCFE at logic 0 (its default state), software can read and write
I/O registers during the break state without affecting status bits. Some
status bits have a 2-step read/write clearing procedure. If software does
the first step on such a bit before the break, the bit cannot change during
the break state as long as BCFE is at logic 0. After the break, doing the
second step clears the status bit.
Since the SPTE bit cannot be cleared during a break with the BCFE bit
cleared, a write to the transmit data register in break mode does not
initiate a transmission nor is this data transferred into the shift register.
Therefore, a write to the SPDR in break mode with the BCFE bit cleared
has no effect.
The SPI module has five I/O pins and shares four of them with a parallel
I/O port. They are:
•
•
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
MISO — Data received
MOSI — Data transmitted
SPSCK — Serial clock
SS — Slave select
CGND — Clock ground (internally connected to V
Serial Peripheral Interface Module (SPI)
(SIM).)
Go to: www.freescale.com
Section 8. System Integration
MC68HC908AB32
SS
)
MOTOROLA
—
Rev. 1.0
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