MCF5272 ColdFire Integrated Microproce" />
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� MCF5272VF66R2J
寤犲晢锛� Freescale Semiconductor
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 274/544闋�(y猫)
鏂囦欢澶у皬锛� 0K
鎻忚堪锛� IC MCU 32BIT 66MHZ 196-MAPBGA
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 750
绯诲垪锛� MCF527x
鏍稿績铏曠悊鍣細 Coldfire V2
鑺珨灏哄锛� 32-浣�
閫熷害锛� 66MHz
閫i€氭€э細 EBI/EMI锛屼互澶恫(w菐ng)锛孖²C锛孲PI锛孶ART/USART锛孶SB
澶栧湇瑷�(sh猫)鍌欙細 DMA锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 32
绋嬪簭瀛樺劜(ch菙)鍣ㄥ閲忥細 16KB锛�4K x 32锛�
绋嬪簭瀛樺劜(ch菙)鍣ㄩ鍨嬶細 ROM
RAM 瀹归噺锛� 1K x 32
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 3 V ~ 3.6 V
鎸暕鍣ㄥ瀷锛� 澶栭儴
宸ヤ綔婧害锛� 0°C ~ 70°C
灏佽/澶栨锛� 196-LBGA
鍖呰锛� 甯跺嵎 (TR)
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Queued Serial Peripheral Interface (QSPI) Module
MCF5272 ColdFire Integrated Microprocessor User鈥檚 Manual, Rev. 3
Freescale Semiconductor
14-7
14.4.3
Transfer Delays
The QSPI supports programmable delays for the QSPI_CS signals before and after a transfer. The time
between QSPI_CS assertion and the leading QSPI_CLK edge, and the time between the end of one transfer
and the beginning of the next, are both independently programmable.
The chip select to clock delay enable (DSCK) bit in command RAM, QCR[DSCK], enables the
programmable delay period from QSPI_CS assertion until the leading edge of QSPI_CLK. QDLYR[QCD]
determines the period of delay before the leading edge of QSPI_CLK. The following expression
determines the actual delay before the QSPI_CLK leading edge:
QSPI_CS-to-QSPI_CLK delay = QCD/CLKIN frequency
QCD has a range of 1鈥�127.
When QCD or DSCK equals zero, the standard delay of one-half the QSPI_CLK period is used.
The delay after transmit enable (DT) bit in command RAM enables the programmable delay period from
the negation of the QSPI_CS signals until the start of the next transfer. The 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. There are two transfer delay options: the user can
choose to delay a standard period after serial transfer is complete or can specify a delay period. Writing a
value to QDLYR[DTL] specifies a delay period. The DT bit in command RAM determines whether the
standard delay period (DT = 0) or the specified delay period (DT = 1) is used. The following expression
is used to calculate the delay:
Delay after transfer = 32
脳 QDLYR[DTL] /CLKIN frequency (DT = 1)
where QDLYR[DTL] has a range of 1鈥�255.
A zero value for DTL causes a delay-after-transfer value of 8192/CLKIN frequency.
Standard delay after transfer = 17/CLKIN frequency (DT = 0)
Receiving devices need at least the standard delay (DT=0) between successive transfers for long data
streams because the QSPI module requires time to load a transmit RAM entry for transfer. If CLKIN is
operating at a slower rate, the delay between transfers must be increased proportionately.
Table 14-2. QSPI_CLK Frequency as Function of CPU Clock and Baud Rate
QMR [BAUD]
CPU Clock
66 MHz
48 MHz
33 MHz
20 MHz
2
16,500,000
12,000,000
8,250,000
5,000,000
4
8,250,000
6,000,000
4,125,000
2,500,000
8
4,125,000
3,000,000
2,062,500
1,250,000
16
2,062,500
1,500,000
1,031,250
625,000
32
1,031,250
750,000
515,625
312,500
255
129,412
94,118
64,706
39,216
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