S908AC4MDRE FREESCALE [Freescale Semiconductor, Inc], S908AC4MDRE Datasheet - Page 188
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S908AC4MDRE
Manufacturer Part Number
S908AC4MDRE
Description
M68HC08 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.S908AC4MDRE.pdf
(274 pages)
- Current page: 188 of 274
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Serial Peripheral Interface (SPI) Module
15.8.3 SPI Data Register
The SPI data register consists of the read-only receive data register and the write-only transmit data
register. Writing to the SPI data register writes data into the transmit data register. Reading the SPI data
register reads data from the receive data register. The transmit data and receive data registers are
separate registers that can contain different values. See
R7–R0/T7–T0 — Receive/Transmit Data Bits
188
Reset:
Read:
Write:
Do not use read-modify-write instructions on the SPI data register because
the register read is not the same as the register written.
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 5
Bit 7
R7
T7
Figure 15-15. SPI Data Register (SPDR)
R6
T6
6
R5
T5
5
Unaffected by reset
NOTE
R4
T4
4
Figure
R3
T3
3
15-2.
R2
T2
2
R1
T1
1
Freescale Semiconductor
Bit 0
R0
T0
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