mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 440

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Serial Peripheral Interface (S12SPIV5)
15.3.2.2
Read: Anytime
Write: Anytime; writes to the reserved bits have no effect
440
Module Base +0x0001
Reset
LSBFE
SSOE
Field
1
0
W
R
Slave Select Output Enable — The SS output feature is enabled only in master mode, if MODFEN is set, by
asserting the SSOE as shown in
progress and force the SPI system into idle state.
LSB-First Enable — This bit does not affect the position of the MSB and LSB in the data register. Reads and
writes of the data register always have the MSB in the highest bit position. In master mode, a change of this bit
will abort a transmission in progress and force the SPI system into idle state.
0 Data is transferred most significant bit first.
1 Data is transferred least significant bit first.
SPI Control Register 2 (SPICR2)
0
0
7
MODFEN
= Unimplemented or Reserved
0
0
1
1
XFRW
0
6
Table 15-2. SPICR1 Field Descriptions (continued)
SSOE
Figure 15-4. SPI Control Register 2 (SPICR2)
0
1
0
1
Table 15-3. SS Input / Output Selection
S12XS Family Reference Manual, Rev. 1.10
0
0
5
Table
SS input with MODF feature
15-3. In master mode, a change of this bit will abort a transmission in
SS is slave select output
MODFEN
SS not used by SPI
SS not used by SPI
Master Mode
0
4
Description
BIDIROE
0
3
0
0
2
Slave Mode
SS input
SS input
SS input
SS input
SPISWAI
Freescale Semiconductor
0
1
SPC0
0
0