SPI1_C2 field descriptions (continued)
Field
Description
When the SPI is configured for slave mode, this bit has no meaning or effect. (The SS pin is the slave
select input.) In master mode, this bit determines how the SS pin is used. For details, refer to the
description of the SSOE bit in the C1 register.
0
Mode fault function disabled, master SS pin reverts to general-purpose I/O not controlled by SPI
1
Mode fault function enabled, master SS pin acts as the mode fault input or the slave select output
3
BIDIROE
Bidirectional Mode Output Enable
When bidirectional mode is enabled because SPI pin control 0 (SPC0) is set to 1, BIDIROE determines
whether the SPI data output driver is enabled to the single bidirectional SPI I/O pin. Depending on whether
the SPI is configured as a master or a slave, it uses the MOSI (MOMI) or MISO (SISO) pin, respectively,
as the single SPI data I/O pin. When SPC0 is 0, BIDIROE has no meaning or effect.
0
Output driver disabled so SPI data I/O pin acts as an input
1
SPI I/O pin enabled as an output
2
Reserved
This field is reserved.
Do not write to this reserved bit.
1
SPISWAI
SPI Stop in Wait Mode
This bit is used for power conservation while the device is in Wait mode.
0
SPI clocks continue to operate in Wait mode.
1
SPI clocks stop when the MCU enters Wait mode.
0
SPC0
SPI Pin Control 0
Enables bidirectional pin configurations.
0
SPI uses separate pins for data input and data output (pin mode is normal).
In master mode of operation: MISO is master in and MOSI is master out.
In slave mode of operation: MISO is slave out and MOSI is slave in.
1
SPI configured for single-wire bidirectional operation (pin mode is bidirectional).
In master mode of operation: MISO is not used by SPI; MOSI is master in when BIDIROE is 0 or
master I/O when BIDIROE is 1.
In slave mode of operation: MISO is slave in when BIDIROE is 0 or slave I/O when BIDIROE is 1;
MOSI is not used by SPI.
17.3.3 SPI Baud Rate Register (SPIx_BR)
Use this register to set the prescaler and bit rate divisor for an SPI master. This register
may be read or written at any time.
Address: 30A0h base + 2h offset = 30A2h
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
0
0
0
0
0
0
0
0
Memory map/register definition
MC9S08PT60 Reference Manual, Rev. 4, 08/2014
478
Freescale Semiconductor, Inc.
Содержание MC9S08PT60
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