MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 299
MC68HC908LK24
Manufacturer Part Number
MC68HC908LK24
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908LK24.pdf
(465 pages)
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14.7 Queuing Transmission Data
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
The double-buffered transmit data register allows a data byte to be
queued and transmitted. For an SPI configured as a master, a queued
data byte is transmitted immediately after the previous transmission has
completed. The SPI transmitter empty flag (SPTE) indicates when the
transmit data buffer is ready to accept new data. Write to the transmit
data register only when the SPTE bit is high.
timing associated with doing back-to-back transmissions with the SPI
(SPSCK has CPHA: CPOL = 1:0).
The transmit data buffer allows back-to-back transmissions without the
slave precisely timing its writes between transmissions as in a system
with a single data buffer. Also, if no new data is written to the data buffer,
the last value contained in the shift register is the next data word to be
transmitted.
CPHA:CPOL = 1:0
WRITE TO SPDR
1
2
3
4 FIRST INCOMING BYTE TRANSFERS FROM SHIFT
5
6 CPU READS SPSCR WITH SPRF BIT SET.
READ SPSCR
Freescale Semiconductor, Inc.
CPU WRITES BYTE 1 TO SPDR, CLEARING SPTE BIT.
BYTE 1 TRANSFERS FROM TRANSMIT DATA
REGISTER TO SHIFT REGISTER, SETTING SPTE BIT.
CPU WRITES BYTE 2 TO SPDR, QUEUEING BYTE 2
AND CLEARING SPTE BIT.
REGISTER TO RECEIVE DATA REGISTER, SETTING
SPRF BIT.
BYTE 2 TRANSFERS FROM TRANSMIT DATA
REGISTER TO SHIFT REGISTER, SETTING SPTE BIT.
READ SPDR
For More Information On This Product,
SPSCK
Serial Peripheral Interface Module (SPI)
SPTE
SPRF
MOSI
Figure 14-8. SPRF/SPTE CPU Interrupt Timing
1
Go to: www.freescale.com
MSB BIT
BYTE 1
2
6
BIT
5
3
BIT
4
BIT
3
BIT
2
BIT
1
10
11 CPU READS SPSCR WITH SPRF BIT SET.
12 CPU READS SPDR, CLEARING SPRF BIT.
Serial Peripheral Interface Module (SPI)
7 CPU READS SPDR, CLEARING SPRF BIT.
8
9
LSB MSB BIT
5
4
CPU WRITES BYTE 3 TO SPDR, QUEUEING BYTE
3 AND CLEARING SPTE BIT.
SECOND INCOMING BYTE TRANSFERS FROM SHIFT
REGISTER TO RECEIVE DATA REGISTER, SETTING
SPRF BIT.
BYTE 3 TRANSFERS FROM TRANSMIT DATA
REGISTER TO SHIFT REGISTER, SETTING SPTE BIT.
BYTE 2
6
6
Figure 14-8
7
BIT
5
8
Queuing Transmission Data
BIT
4
BIT
3
BIT
2
BIT
1
shows the
LSB MSB BIT
10
9
BYTE 3
11
Data Sheet
6
12
BIT
5
299
BIT
4
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