MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 267
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60ACFU.pdf
(480 pages)
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MC68HC08AZ60A — Rev 0.0
MOTOROLA
SCK (CPHA:CPOL =‘1’:0)
1
2
3
4
5
6
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.
FIRST INCOMING BYTE TRANSFERS FROM SHIFT
REGISTER TO RECEIVE DATA REGISTER, SETTING
SPRF BIT.
BYTE 2 TRANSFERS FROM TRANSMIT DATA
REGISTER TO SHIFT REGISTER, SETTING SPTE BIT.
CPU READS SPSCR WITH SPRF BIT SET.
WRITE TO SPDR
READ SPSCR
READ SPDR
SPRF
SPTE
MOSI
Figure 17-10. SPRF/SPTE CPU Interrupt Timing
For a slave, the transmit data buffer allows back-to-back transmissions
to occur without the slave having to time the write of its data between the
transmissions. Also, if no new data is written to the data buffer, the last
value contained in the shift register will be the next data word
transmitted.
1
Serial Peripheral Interface (SPI)
MSB BIT
BYTE 1
2
6
BIT
5
3
BIT
4
BIT
3
BIT
10
11 CPU READS SPSCR WITH SPRF BIT SET.
12 CPU READS SPDR, CLEARING SPRF BIT.
2
7
8
9
BIT
CPU READS SPDR, CLEARING SPRF BIT.
1
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.
LSB MSB BIT
5
4
BYTE 2
6
6
7
BIT
5
8
BIT
4
BIT
3
Serial Peripheral Interface (SPI)
BIT
2
Queuing Transmission Data
BIT
1
LSB MSB BIT
10
9
Advance Information
BYTE 3
11
6
12
BIT
5
BIT
4
267
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