MC9S12HY64 Datasheet, PDF(469/792 Page) Freescale Semiconductor, Inc – S12 Microcontrollers

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MC9S12HY64 Datasheet, PDF (469/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

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Serial Peripheral Interface (S12SPIV5)

Table 13-9. SPIF Interrupt Flag Clearing Sequence

XFRW Bit

SPIF Interrupt Flag Clearing Sequence

0

Read SPISR with SPIF == 1 then

Read SPIDRL

1

Read SPISR with SPIF == 1

Byte Read SPIDRL 1

or

then Byte Read SPIDRH 2 Byte Read SPIDRL

or

Word Read (SPIDRH:SPIDRL)

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

of SPIDRL after reading SPISR with SPIF == 1.

Table 13-10. SPTEF Interrupt Flag Clearing Sequence

XFRW Bit

SPTEF Interrupt Flag Clearing Sequence

0

Read SPISR with SPTEF == 1 then

Write to SPIDRL 1

1 Read SPISR with SPTEF == 1

Byte Write to SPIDRL 12

or

then Byte Write to SPIDRH 13 Byte Write to SPIDRL 1

or

Word Write to (SPIDRH:SPIDRL) 1

1 Any write to SPIDRH or SPIDRL with SPTEF == 0 is effectively ignored.

2 Data in SPIDRH is undeï¬ned in this case.

3 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.

MC9S12HY/HA-Family Reference Manual Rev. 1.04

Freescale Semiconductor

469

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