MMC2107 Datasheet, PDF (385/618 Pages) –

Freescale Semiconductor, Inc.
Serial Peripheral Interface Module (SPI)
Memory Map and Registers
17.7.8 SPI Port Data Direction Register
Address: 0x00cb_0008
Bit 7
6
5
4
3
2
1
Bit 0
Read:
RSVD7
Write:
RSVD6
RSVD5
RSVD4 DDRSP3 DDRSP2 DDRSP1 DDRSP0
Reset: 0
0
0
0
0
0
0
0
Pin function:
SS
SCK
MOSI/
MOMI
MISO/
SISO
Figure 17-9. SPI Port Data Direction Register (SPIDDR)
Read: Anytime
Write: Anytime
RSVD[7:4] — Reserved
Writing to these read/write bits updates their values but has no effect
on functionality.
DDRSP[3:0] — Data Direction Bits
The DDRSP[3:0] bits control the data direction of SPIPORT pins.
Reset clears DDRSP[3:0].
1 = Corresponding pin configured as output
0 = Corresponding pin configured as input
In slave mode, DDRSP3 has no meaning or effect. In master mode,
DDRSP3 determines whether SPI port pin 3 is a mode-fault input, a
general-purpose output, or a slave-select output.
NOTE: When the SPI is enabled (SPE = 1), the MISO, MOSI, and SCK pins:
• Are inputs if their SPI functions are input functions regardless of
the state of their DDRSP bits.
• Are outputs if their SPI functions are output functions only if their
DDRSP bits are set.
MMC2107 – Rev. 2.0
MOTOROLA
Serial Peripheral Interface Module (SPI)
For More Information On This Product,
Go to: www.freescale.com
Technical Data
385