s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 185

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

17.13.3 SPI Data Register
The SPI data register is the read/write buffer for the receive data register and the 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
buffers that can contain different values. See
R7–R0/T7–T0 — Receive/Transmit Data Bits
Freescale Semiconductor
Address:
Do not use read-modify-write instructions on the SPI data register since the
buffer read is not the same as the buffer written.
Reset:
Read:
Write:
$0012
Bit 7
R7
T7
Figure 17-14. SPI Data Register (SPDR)
R6
T6
6
MC68HC908AZ32A Data Sheet, Rev. 2
R5
T5
5
Figure
Indeterminate after Reset
NOTE
R4
T4
4
17-2.
R3
T3
3
R2
T2
2
R1
T1
1
Bit 0
R0
T0
I/O Registers
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