S912XEQ384J3MALR Freescale Semiconductor, S912XEQ384J3MALR Datasheet - Page 771

• Manufacturer Part Number: S912XEQ384J3MALR
• Description: S912XEQ Series 16 Bit 50 Mhz 384 KB Flash 24 KB Ram Microcontroller - LQFP-112
• Manufacturer: Freescale Semiconductor

Freescale Semiconductor
1. Data in SPIDRH is lost in this case.
2. SPIDRH can be read repeatedly without any effect on SPIF. SPIF Flag is cleared only by the read
1. Any write to SPIDRH or SPIDRL with SPTEF == 0 is effectively ignored.
2. Data in SPIDRH is undefined in this case.
3. SPIDRH can be written repeatedly without any effect on SPTEF. SPTEF Flag is cleared only by
XFRW Bit
XFRW Bit
of SPIDRL after reading SPISR with SPIF == 1.
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 21-10. SPTEF Interrupt Flag Clearing Sequence
Table 21-9. SPIF Interrupt Flag Clearing Sequence
MC9S12XE-Family Reference Manual Rev. 1.24
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
Chapter 21 Serial Peripheral Interface (S12SPIV5)
Read SPIDRL
1(3)
or
or
(2)
or
or
Byte Write to SPIDRL
Byte Read SPIDRL
(1)
1(2)
(1)
1
1
771