XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 316

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

Serial Peripheral Interface (SPI)
19.14.3 SPI Data Register
Technical Data
316
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 19-1
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:
$0012
Bit 7
R7
T7
Serial Peripheral Interface (SPI)
Figure 19-13. SPI Data Register (SPDR)
R6
T6
6
R5
T5
5
Indeterminate after Reset
R4
T4
4
R3
T3
3
MC68HC908AZ60A — Rev 2.0
R2
T2
2
R1
T1
1
MOTOROLA
Bit 0
R0
T0