mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 241

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

WOMQ — Wired-OR Mode for QSPI Pins
BITS — Bits Per Transfer
CPOL — Clock Polarity
CPHA — Clock Phase
SPBR — Serial Clock Baud Rate
D.4.11 SPCR1 — QSPI Control Register 1
SPE — QSPI Enable
DSCKL — Delay before SCK
MC68331
USER’S MANUAL
DTL — Length of Delay after Transfer
SPE
15
0
The BITS field determines the number of serial data bits transferred.
QSPI baud rate is selected by writing a value from 2 to 255 into SPBR. Giving BR a
value of zero or one disables SCK (disable state determined by CPOL).
SPCR1 enables the QSPI and specified transfer delays. The CPU32 has read/write
access to SPCR1, but the QSM has read access only to all bits but enable bit SPE.
SPCR1 must be written last during initialization because it contains SPE. Writing a
new value to SPCR1 while the QSPI is enabled disrupts operation.
When the DSCK bit in command RAM is set, this field determines the length of delay
from PCS valid to SCK transition. PCS can be any of the four peripheral chip-select
pins.
When the DT bit in command RAM is set, this field determines the length of delay after
serial transfer.
RESET:
0 = Outputs have normal MOS drivers.
1 = Pins designated for output by DDRQS have open-drain drivers.
0 = The inactive state value of SCK is logic level zero.
1 = The inactive state value of SCK is logic level one.
0 =Data captured on the leading edge of SCK and changed on the following edge
1 =Data is changed on the leading edge of SCK and captured on the following
0 = QSPI is disabled. QSPI pins can be used for general-purpose I/O.
1 = QSPI is enabled. Pins allocated by PQSPAR are controlled by the QSPI.
14
0
of SCK.
edge of SCK.
0
0
Freescale Semiconductor, Inc.
DSCKL
For More Information On This Product,
0
1
Go to: www.freescale.com
REGISTER SUMMARY
0
8
0
7
0
0
0
0
DTL
0
1
$YFFC1A
0
D-33
0
0
D