MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 418

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 14 Serial Peripheral Interface (SPIV3) Block Description
14.3.2.4
Read: anytime
Write: has no effect
14.3.2.5
Read: anytime; normally read only after SPIF is set
418
Module Base 0x0003
Module Base 0x0005
SPTEF
Reset
Reset
MODF
Field
SPIF
7
5
4
W
W
R
R
SPIF
SPIF Interrupt Flag — This bit is set after a received data byte has been transferred into the SPI Data Register.
This bit is cleared by reading the SPISR register (with SPIF set) followed by a read access to the SPI Data
Register.
0 Transfer not yet complete
1 New data copied to SPIDR
SPI Transmit Empty Interrupt Flag — If set, this bit indicates that the transmit data register is empty. To clear
this bit and place data into the transmit data register, SPISR has to be read with SPTEF = 1, followed by a write
to SPIDR. Any write to the SPI Data Register without reading SPTEF = 1, is effectively ignored.
0 SPI Data register not empty
1 SPI Data register empty
Mode Fault Flag — This bit is set if the SS input becomes low while the SPI is configured as a master and mode
fault detection is enabled, MODFEN bit of SPICR2 register is set. Refer to MODFEN bit description in
Section 14.3.2.2, “SPI Control Register 2 (SPICR2).”
Register (with MODF set) followed by a write to the SPI Control Register 1.
0 Mode fault has not occurred.
1 Mode fault has occurred.
Bit 7
SPI Status Register (SPISR)
SPI Data Register (SPIDR)
0
0
7
7
= Unimplemented or Reserved
= Unimplemented or Reserved
0
0
6
0
6
6
Figure 14-6. SPI Status Register (SPISR)
Figure 14-7. SPI Data Register (SPIDR)
Table 14-8. SPISR Field Descriptions
SPTEF
1
5
0
5
5
MC9S12Q128
MODF
Rev 1.09
0
4
0
4
4
Description
The flag is cleared automatically by a read of the SPI Status
0
0
3
0
3
3
0
0
2
0
2
2
Freescale Semiconductor
0
0
2
0
1
1
Bit 0
0
0
0
0
0