mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 445

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

Freescale Semiconductor
1
2
1
2
3
XFRW Bit
XFRW Bit
Data in SPIDRH is lost in this case.
SPIDRH can be read repeatedly without any effect on SPIF. SPIF Flag is cleared only by the read
of SPIDRL after reading SPISR with SPIF == 1.
Any write to SPIDRH or SPIDRL with SPTEF == 0 is effectively ignored.
Data in SPIDRH is undefined in this case.
SPIDRH can be written repeatedly without any effect on SPTEF. SPTEF Flag is cleared only by
writing to SPIDRL after reading SPISR with SPTEF == 1.
0
1
0
1
Read SPISR with SPTEF == 1 then
Read SPISR with SPTEF == 1
Read SPISR with SPIF == 1
Read SPISR with SPIF == 1
Table 15-10. SPTEF Interrupt Flag Clearing Sequence
Table 15-9. SPIF Interrupt Flag Clearing Sequence
S12XS Family Reference Manual, Rev. 1.10
SPTEF Interrupt Flag Clearing Sequence
SPIF Interrupt Flag Clearing Sequence
then
then
then
Byte Write to SPIDRH
Byte Read SPIDRH
Word Write to (SPIDRH:SPIDRL)
Word Read (SPIDRH:SPIDRL)
Byte Write to SPIDRL
Byte Read SPIDRL
Write to SPIDRL
Read SPIDRL
13
or
or
2
or
or
Byte Write to SPIDRL
Serial Peripheral Interface (S12SPIV5)
Byte Read SPIDRL
1
12
1
1
1
445