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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 140/140頁(yè) |
| 文件大小： | 847K |
| 代理商： | MC68HC05E5DW |
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Synchronous Serial Interface (SSI)
SSI Registers
MC68HC05E5 — Rev. 1.0
General Release Specification
MOTOROLA
Synchronous Serial Interface (SSI)
99
NON-DISCLOSURE
AGREEMENT
REQUIRED
LSBF — Least Significant Bit First
The LSBF bit determines the format of the data transfer. The two
formats are least significant bit (LSB) or most significant bit (MSB)
transferred or received first. Reset clears this bit, initializing the SSI to
MSB first order.
1 = Data will be sent and received in an LSB first format.
0 = Data will be sent and received in an MSB first format.
MSTR — Master Mode
Reset clears this bit and configures the SSI for slave operation. MSTR
may be set at any time regardless of the state of SE.
1 = SSI is configured for master mode. The transmission is initiated
by a write to the data register and the SCK pin becomes an
output providing a synchronous data clock at a rate determined
by the SR bit.
0 = SSI is configured to slave mode. Any transmission in progress
is aborted. Transfers are initiated by an external master which
should supply the clock signal to the SCK pin.
CPOL — Clock Polarity
The clock polarity bit controls the state of the SCK pin between
transmissions.
1 = SCK will be high between transmissions.
0 = SCK will be low between transmissions.
In both cases, the data is latched on the rising edge of SCK for serial
input and is valid on the rising edge of SCK for serial output. Reset
sets this bit.
SDIR — Serial Data Direction
When the SE bit = 1, SDIR functions as the output driver enable bit
for the SDIO pin with SSI in master or in slave mode. This bit has no
effect on the SDIO pin when the SSI is disabled (SE = 0). This bit is
cleared by reset.
1 = Enable the output driver of the SDIO pin.
0 = Disable the output driver of the SDIO pin.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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