MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 316

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MC68HC708AS48

Manufacturer Part Number
MC68HC708AS48
Description
Advance Information
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
Serial Peripheral Interface (SPI)
18.14.3 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
Figure
Address:
Read:
Write:
Reset:
R7:R0/T7:T0 — Receive/Transmit Data Bits
NOTE:
Do not use read-modify-write instructions on the SPI data register since
the buffer read is not the same as the buffer written.
Advance Information
316
18-2.
$0012
Bit 7
6
5
4
R7
R6
R5
R4
T7
T6
T5
T4
Indeterminate after Reset
Figure 18-15. SPI Data Register (SPDR)
Serial Peripheral Interface (SPI)
3
2
1
Bit 0
R3
R2
R1
R0
T3
T2
T1
T0
MC68HC708AS48
Rev. 4.0
MOTOROLA

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