參數(shù)資料
型號: MC68HC705CT4FB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.048 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 122/152頁
文件大?。?/td> 964K
代理商: MC68HC705CT4FB
Synchronous Serial Interface (SSI)
Signal Format
MC68HC705CT4 Rev. 2.0
General Release Specification
MOTOROLA
Synchronous Serial Interface (SSI)
71
NON-DISCLOSURE
AGREEMENT
REQUIRED
9.3 Signal Format
The SSI is comprised of two main input/output (I/O) signals that interface
with port D serial clock and serial data.
9.3.1 Serial Clock (SCK)
When SE = 0, this pin is a port D bit 5 pin, which follows the port D DDR
assignment.
In master mode (MSTR = 1), the serial clock (SCK) pin is an output with
four selectable frequencies. This pin will be high (CPOL = 1) or low
(CPOL = 0) between transmissions.
In slave mode (MSTR = 0), the SCK pin is an input and the clock must
be supplied by an external master with a maximum frequency of f
OP/2.
There is no minimum SCK frequency. This pin should be driven high
(CPOL = 1) or low (CPOL = 0) between transmissions by the external
master and must be stable before the SSI is first enabled (SE = 1).
Data is always captured at the serial data in/out (SDIO) pin on the rising
edge of SCK.
Data is always shifted out and presented at the serial data in/out (SDIO)
pin on the falling edge of SCK.
9.3.2 Serial Data In/Out (SDIO)
Prior to enabling the SSI (SE = 0), the serial data in/out (SDIO) pin is a
port D bit 4 pin, which follows the port D DDR assignment. When the SSI
is enabled (SE = 1) the SDIO pin becomes a high-impedance input pin
if the T/R bit is low or it idles high if the T/R bit is high.
The data can be sent or received in either MSB first format (LSBF = 0)
or LSB first format (LSBF = 1).
If (CPOL = 1), the first falling edge of SCK will shift the first data bit out
to the SDIO pin. Subsequent falling edges of SCK will shift the remaining
data bits out.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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