參數(shù)資料
型號: HC05V7GRS
英文描述: 68HC05V7 General Release Specification
中文描述: 68HC05V7一般版本規(guī)范
文件頁數(shù): 99/170頁
文件大?。?/td> 980K
代理商: HC05V7GRS
SECTION 14: SERIAL PERIPHERAL INTERFACE
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Page 85
14.1.4
The slave select (SS) input line is used to select a slave device. It has to be low prior to
data transactions and must stay low for the duration of the transaction.The SS line on the
master must be tied high. If it goes low, a mode fault error flag (MODF) is set in the SPSR.
When CPHA=0, the shift clock is the OR of SS with SCK. In this clock phase mode, SS
must go high between successive characters in an SPI message. When CPHA=1, SS may
be left low for several SPI characters. In cases where there is only one SPI slave MCU, its
SS line could be tied to V
SS
as long as CPHA=1 clock modes are used. The SS pin is
shared with the PF0 pin. See
9.4PORT F
for additional information on the SS pin.
Slave Select (SS/PF0)
14.2
Figure 14-2 shows a block diagram of the serial peripheral interface circuitry. When a
master device transmits data to a slave via the MOSI line, the slave device responds by
sending data to the master device via the master’s MISO line. This implies full duplex
transmission with both data out and data in synchronized with the same clock signal. Thus,
the byte transmitted is replaced by the byte received and eliminates the need for separate
transmit-empty and receive-full status bits. A single status bit (SPIF) is used to signify that
the I/O operation has been completed.
The SPI is double buffered on read, but not on write. If a write is performed during data
transfer, the transfer occurs uninterrupted, and the write will be unsuccessful. This
condition will cause the write collision (WCOL) status bit in the SPSR to be set. After a data
byte is shifted, the SPIF flag of the SPSR is set.
FUNCTIONAL DESCRIPTION
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料
PDF描述
HC05 Bipolar Transistor; Transistor Polarity:Dual P Channel; Power Dissipation:20W; DC Current Gain Min (hfe):25; Collector Current:1A; DC Current Gain Max (hfe):200; Power (Ptot):20W
HC1-5502A-7 Subscriber Line Interface Circuit
HC4P-5502A-7 Subscriber Line Interface Circuit
HC1062A Low Voltage Telephone Speech Transmission Circuit / High/Low Level Mute
HC1198 Peripheral IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HC060WE1DS038B 制造商:TE Connectivity 功能描述:EC7174-000
HC060YW1DS038B 制造商:TE Connectivity 功能描述:EC7207-000
HC06B05000J0G 制造商:FCI 功能描述:OEM ITEM 505-5BNF-SPRING CLAMP SYSTEM
HC08 制造商:Texas Instruments 功能描述:
HC08100 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Breake Away Header .025(0.64mm) Square Posts