參數(shù)資料
型號： MC68HC05E5DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： SOIC-28
文件頁數(shù)： 139/140頁
文件大小： 847K
代理商： MC68HC05E5DW
NON-DISCLOSURE
AGREEMENT
REQUIRED
Synchronous Serial Interface (SSI)
General Release Specification
MC68HC05E5 — Rev. 1.0
98
Synchronous Serial Interface (SSI)
MOTOROLA
12.4 SSI Registers
The SSI registers are described in the following subsections.
12.4.1 SSI Control Register
This register is located at address $000A. A reset clears all of these bits,
except bit 3 which is set. Writes to this register during a transfer should
be avoided, with the exception of clearing the SE bit to disable the SSI.
In addition, the clock polarity, rate, data format, and master/slave
selection should not be changed while the SSI is enabled (SE = 1) or
being enabled. Always disable the SSI, by clearing the SE bit, before
altering control bits within the SCR.
SIE — SSI Interrupt Enable
This bit determines whether an interrupt request should be generated
when a transfer is complete. Reset clears this bit.
1 = An interrupt request will be made if the CPU is in the run or wait
mode of operation and the status flag bit SF is set.
0 = No interrupt requests will be made by the SSI.
SE — SSI Enable
When this bit is set, it enables the SSI and SCK pins. When this bit is
cleared, any transmission in progress is aborted and the SCK and
SDIO are three-stated. The SE bit is readable and writable any time.
Clearing SE while a data transfer is occurring will abort the
transmission and reset the bit counter. Reset clears this bit.
1 = Enable the SSI module.
0 = Disable the SSI module.
Address:
$000A
Bit 7
654321
Bit 0
Read:
SIE
SE
LSBF
MSTR
CPOL
SDIR
SR1
SR0
Write:
Reset:
00001000
Figure 12-4. SSI Control Register (SCR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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