MC68HC08AZ60CFU MOTOROLA [Motorola, Inc], MC68HC08AZ60CFU Datasheet - Page 225
MC68HC08AZ60CFU
Manufacturer Part Number
MC68HC08AZ60CFU
Description
Advance Information
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60CFU.pdf
(452 pages)
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Mode Fault Error
15-spi
MOTOROLA
READ SPSCR
SPI RECEIVE
READ SPDR
COMPLETE
Figure 7. Clearing SPRF When OVRF Interrupt Is Not Enabled
OVRF
SPRF
1
2
3
4
5
6
7
BYTE 1
BYTE 2 SETS SPRF BIT.
CPU READS SPSCR WITH SPRF BIT SET
AND OVRF BIT CLEAR.
BYTE 3 SETS OVRF BIT. BYTE 3 IS LOST.
BYTE 1 SETS SPRF BIT.
CPU READS SPSCR WITH SPRF BIT SET
AND OVRF BIT CLEAR.
CPU READS BYTE 1 IN SPDR,
CLEARING SPRF BIT.
CPU READS SPSCR AGAIN
TO CHECK OVRF BIT.
1
For the MODF flag (in SPSCR) to be set, the mode fault error enable bit
(MODFEN in SPSCR) must be set. Clearing the MODFEN bit does not
clear the MODF flag but does prevent MODF from being set again after
MODF is cleared.
MODF generates a receiver/error CPU interrupt request if the error
interrupt enable bit (ERRIE in SPSCR) is also set. The SPRF, MODF,
and OVRF interrupts share the same CPU interrupt vector. MODF and
OVRF can generate a receiver/error CPU interrupt request. (See
8). It is not possible to enable only MODF or OVRF to generate a
receiver/error CPU interrupt request. However, leaving MODFEN low
prevents MODF from being set.
Freescale Semiconductor, Inc.
2
For More Information On This Product,
Serial Peripheral Interface Module (SPI)
3
Go to: www.freescale.com
4
BYTE 2
5
BYTE 3
6
7
10
11
12
13
14
8
9
8
CPU READS SPSCR AGAIN
TO CHECK OVRF BIT.
CPU READS BYTE 2 SPDR,
CLEARING OVRF BIT.
BYTE 4 SETS SPRF BIT.
CPU READS SPSCR.
CPU READS BYTE 4 IN SPDR,
CLEARING SPRF BIT.
CPU READS SPSCR AGAIN
TO CHECK OVRF BIT.
CPU READS BYTE 2 IN SPDR,
CLEARING SPRF BIT.
Serial Peripheral Interface Module (SPI)
9
BYTE 4
10
11
MC68HC08AZ60 — Rev 1.0
12
13
Error Conditions
14
Figure
225
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