- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361324 > QSMRM QSMRM QSM Queued Serial Module Reference Manual PDF資料下載
參數(shù)資料
| 型號(hào)： | QSMRM |
| 英文描述： | QSMRM QSM Queued Serial Module Reference Manual |
| 中文描述： | QSMRM QSM排隊(duì)串行模塊參考手冊 |
| 文件頁數(shù)： | 34/112頁 |
| 文件大?。?/td> | 1496K |
| 代理商： | QSMRM |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁當(dāng)前第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁
MOTOROLA
4-6
QSPI SUBMODULE
QSM
REFERENCE MANUAL
CPHA determines which edge of SCK causes data to change and which edge of SCK
causes data to be captured. CPHA is used in conjunction with CPOL to produce the
desired clock-data relationship between master and slave device(s). Note that CPHA
is set at reset.
SPBR — Serial Clock Baud Rate
The QSPI internally generates the baud rate for SCK, the frequency of which is pro-
grammable by the user. The clock signal is derived from the MCU system clock using
a modulus counter. At reset, BAUD is initialized to a 2.1-MHz SCK frequency (16.78-
MHz system clock).
The user programs a baud rate for SCK by writing a baud value from 2 to 255. The
following equation determines the SCK baud rate:
SCK Baud Rate = System Clock/(2 *
SPBR)
(4-1)
or
SPBR = System Clock/(2 *
SCK Baud Rate Desired)
(4-2)
where SPBR equals 2, 3, 4,..., 255.
Programming SPBR with the values zero or one disables the QSPI baud rate genera-
tor. SCK is disabled and assumes its inactive state value. No serial transfers occur.
SPBR has 254 active values.
Table 4-3
lists several possible baud values and the cor-
responding SCK frequency based on a 16.78-MHz system clock.
4.3.2 QSPI Control Register 1 (SPCR1)
SPCR1 contains parameters for configuring the QSPI before it is enabled. Although
the CPU can read and write this register, the QSM has read access only, except for
SPE. This bit is automatically cleared by the QSPI after completing all serial transfers
or when a mode fault occurs.
Table 4-3 Examples of SCK Frequencies
System Clock
Frequency
16.78 MHz
Required
Division Ratio
4
8
16
34
168
510
Value of
SPBR
2
4
8
17
84
255
Actual
SCK Frequency
4.19 MHz
2.10 MHz
1.05 MHz
493 kHz
100 kHz
33 kHz
SPCR1
— QSPI Control Register 1
$YFFC1A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SPE
DSCKL
DTL
RESET:
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| QSOP-24 | Package MQA24 |
| QST4 | Low frequency amplifier |
| QST9 | General purpose amplification (−30V, −1A) |
| QSX7 | General purpose amplification (12V, 1.5A) |
| QSZ1 | General purpose transistor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| QSMS-0136 | 制造商:Avago Technologies 功能描述:SCHOTTKY DIODE, PART NUMBER ASSIGNED TO REPLACE HSMS-0005 - Gel-pak, waffle pack, wafer, diced wafer on film |
| QSMS-2926-TR1G | 制造商:Avago Technologies 功能描述:SCHOTTKY DIODE - Tape and Reel |
| QSMT-AW13-NSUZ1 | 制造商:Avago Technologies 功能描述:MS AV,1W CWHITE - Tape and Reel |
| QSMT-FW85-NX000 | 制造商:Avago Technologies 功能描述:THIS HIGH BRIGHTNESS LED LIGHT SOURCE |
| QSMT-L060-227NG | 制造商:Avago Technologies 功能描述:L2 LED CONTOUR LIGHTING,COLORLESS - Rail/Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。