Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 177
Z8FMC04100
Manufacturer Part Number
Z8FMC04100
Description
Z8 Encore-R Motor Control Flash MCUs
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z8FMC04100.pdf
(402 pages)
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PS024604-1005
Slave Operation
Error Detection
The SPI block is configured for SLAVE mode operation by setting the SPIEN bit to 1 and
the MMEN bit to 0 in the SPICTL Register and setting the SSIO bit to 0 in the SPIMODE
Register. The
BITS field in the SPIMODE Register must be set to be consistent with the other SPI
devices. The STR bit in the SPICTL Register can be used, if appropriate, to force a start-
up interrupt. The
ister are not used in SLAVE mode. The SPI baud rate generator is not used in SLAVE
mode; therefore, the SPIBRH and SPIBRL registers do not require initialization.
If the slave contains data to send to the master, the data should be written to the SPIDAT
Register before the transaction starts (first edge of SCK when SS is asserted). If the SPI-
DAT Register is not written prior to the slave transaction, the MISO pin outputs the value
that is currently in the SPIDAT Register.
Due to the delay resulting from synchronization of the SPI input signals to the internal sys-
tem clock, the maximum SPICLK baud rate that can be supported in SLAVE mode is the
system clock frequency (X
The SPI contains error detection logic that supports SPI communication protocols and rec-
ognizes when communication errors have occurred. The SPI Status Register indicates
when a data transmission error has been detected.
Overrun
An overrun error (write collision) indicates that a Write to the SPI Data Register was
attempted while a data transfer is in progress (in either MASTER or SLAVE modes). An
overrun sets the OVR bit in the SPI Status Register to 1. Writing a 1 to OVR clears this
error flag. The SPI Data Register is not altered when a Write occurs while a data transfer is
in progress.
Mode Fault
A mode fault indicates when more than one master is trying to communicate at the same
time (a multimaster collision). The mode fault is detected when the enabled master’s SS
pin is asserted. A mode fault sets the COL bit in the SPI Status Register to 1. Writing a 1 to
COL clears this error flag.
Slave Mode Abort
In SLAVE mode, if the SS pin deasserts before all bits in a character have been trans-
ferred, the transaction aborts. When this condition occurs, the
SPISTAT Register as well as the
IRQE
BIRQ
,
PHASE
bit in the SPICTL Register and the
IN
,
P R E L I M I N A R Y
CLKPOL
) divided by 8. This rate is controlled by the SPI master.
IRQ
, and
bit (which indicates that the transaction is complete).
WOR
bits in the SPICTL Register and the NUM-
Z8FMC16100 Series Flash MCU
SSV
ABT
bit in the SPIMODE Reg-
Product Specification
bit is set in the
Slave Operation
155
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