MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 279
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
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MC68HC08AZ60A — Rev 0.0
MOTOROLA
MODFEN — Mode Fault Enable
SPR1 and SPR0 — SPI Baud Rate Select
The following formula is used to calculate the SPI baud rate:
where:
CGMOUT = base clock output of the clock generator module (CGM)
BD = baud rate divisor
SPR1:SPR0
This read/write bit, when set to ‘1’, allows the MODF flag to be set. If
the MODF flag is set, clearing the MODFEN does not clear the MODF
flag. If the SPI is enabled as a master and the MODFEN bit is low,
then the SS pin is available as a general purpose I/O.
If the MODFEN bit is set, then this pin is not available as a general
purpose I/O. When the SPI is enabled as a slave, the SS pin is not
available as a general purpose I/O regardless of the value of
MODFEN. See SS (Slave Select).
If the MODFEN bit is low, the level of the SS pin does not affect the
operation of an enabled SPI configured as a master. For an enabled
SPI configured as a slave, having MODFEN low only prevents the
MODF flag from being set. It does not affect any other part of SPI
operation. See Mode Fault Error.
In master mode, these read/write bits select one of four baud rates as
shown in
Reset clears SPR1 and SPR0.
00
01
10
11
Table 17-5. SPI Master Baud Rate Selection
Serial Peripheral Interface (SPI)
Table
17-5. SPR1 and SPR0 have no effect in slave mode.
Baud rate
=
CGMOUT
---------------------------
Baud rate divisor (BD)
2
BD
Serial Peripheral Interface (SPI)
128
32
2
8
Advance Information
I/O Registers
279
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