mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 274

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Peripheral Interface (SPI)
18.14.3 SPI Data Register
Technical Data
272
NOTE:
Address:
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
Figure
R7–R0/T7–T0 — Receive/Transmit Data Bits
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:
18-2.
$0012
Bit 7
R7
T7
Serial Peripheral Interface (SPI)
Figure 18-15. SPI Data Register (SPDR)
R6
T6
6
R5
T5
5
Indeterminate after reset
R4
T4
4
R3
T3
3
R2
Freescale Semiconductor
T2
2
MC68HC08QA24
R1
T1
1
Bit 0
R0
T0