參數(shù)資料
型號: MC68HSC05C8A
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 86/156頁
文件大?。?/td> 755K
代理商: MC68HSC05C8A
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Serial Peripiheral Interface (SPI)
General Release Specification
MC68HC05C8A
Rev. 3.0
86
Serial Peripiheral Interface (SPI)
MOTOROLA
In a slave mode, the slave select start logic receives a logic low at the
SS pin and a clock at the SCK pin. Thus, the slave is synchronized with
the master. Data from the master is received serially at the MOSI line
and loads the 8-bit shift register. After the 8-bit shift register is loaded, its
data is parallel transferred to the read buffer. During a write cycle, data
is written into the shift register, then the slave waits for a clock train from
the master to shift the data out on the slave’s MISO line.
Figure 10-3
illustrates the MOSI, MISO, SCK, and SS master-slave
interconnections.
Figure 10-3. Serial Peripheral Interface Master-Slave Interconnection
10.6 SPI Registers
Three registers in the SPI provide control, status, and data storage
functions. These registers are called the serial peripheral control register
(SPCR), serial peripheral status register (SPSR), and serial peripheral
data I/O register (SPDR) and are described in the following paragraphs.
I/O PORT
SPDR ($000C)
SPDR ($000C)
SPI SHIFT REGISTER
SPI SHIFT REGISTER
PD3/MOSI
PD2/MISO
PD4/SCK
MASTER MCU
SLAVE MCU
SS
PD5
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