參數(shù)資料
型號： MC68CK338CPV14
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封裝： PLASTIC, TQFP-144
文件頁數(shù)： 99/133頁
文件大?。?/td> 944K
代理商： MC68CK338CPV14
MOTOROLA
MC68CK338
68
MC68CK338TS/D
DTL[7:0] — Length of Delay after Transfer
When the DT bit in command RAM is set, this field determines the length of delay after serial transfer.
The following equation is used to calculate the delay:
where DTL equals {1, 2, 3,..., 255}.
A zero value for DTL[7:0] causes a delay-after-transfer value of 8192/System Clock.
If DT equals zero, a standard delay is inserted.
Delay after transfer can be used to provide a peripheral deselect interval. A delay can also be inserted
between consecutive transfers to allow serial A/D converters to complete conversion.
SPCR2 contains QSPI configuration parameters. The CPU can read and write this register; the QSM
has read access only. Writes to SPCR2 are buffered. A write to SPCR2 that changes a bit value while
the QSPI is operating is ineffective on the current serial transfer, but becomes effective on the next se-
rial transfer. Reads of SPCR2 return the current value of the register, not of the buffer.
SPIFIE — SPI Finished Interrupt Enable
0 = QSPI interrupts disabled
1 = QSPI interrupts enabled
SPIFIE enables the QSPI to generate a CPU interrupt upon assertion of the status flag SPIF.
WREN — Wrap Enable
0 = Wraparound mode disabled
1 = Wraparound mode enabled
WREN enables or disables wraparound mode.
WRTO — Wrap To
When wraparound mode is enabled, after the end of queue has been reached, WRTO determines
which address the QSPI executes.
Bit 12 — Not Implemented
ENDQP[3:0] — Ending Queue Pointer
This field contains the last QSPI queue address.
Bits [7:4] — Not Implemented
NEWQP[3:0] — New Queue Pointer Value
This field contains the first QSPI queue address.
SPCR2 — QSPI Control Register 2
$YFFC1C
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SPIFIE
WREN
WRTO
0
ENDQP[3:0]
0
NEWQP[3:0]
RESET:
0
Delay after Transfer
32
DTL[7:0]
×
System Clock
------------------------------------
=
Standard Delay after Transfer
17
System Clock
------------------------------------
=
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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