mc68hc08ln56 Freescale Semiconductor, Inc, mc68hc08ln56 Datasheet - Page 134

• Manufacturer Part Number: mc68hc08ln56
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Peripheral Interface Module (SPI)
11.13.3 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
134
Address: $0012
Do not use read-modify-write instructions on the SPI data register since the
register read is not the same as the register written.
Reset:
Read:
Write:
MC68HC08LN56 • MC68HC708LN56 General Release Specification, Rev. 2.1
Bit 7
R7
T7
Figure 11-16. SPI Data Register (SPDR)
R6
T6
6
R5
T5
5
Indeterminate after reset
NOTE
R4
T4
4
Figure
R3
T3
3
11-2.)
R2
T2
2
R1
T1
1
Freescale Semiconductor
Bit 0
R0
T0