參數(shù)資料
型號(hào): PIC16F1512-I/SP
廠商: Microchip Technology
文件頁(yè)數(shù): 97/348頁(yè)
文件大?。?/td> 0K
描述: IC MCU 8BIT 3.5KB FLASH 28-SPDIP
標(biāo)準(zhǔn)包裝: 15
系列: PIC® XLP™ 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,LIN,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 25
程序存儲(chǔ)器容量: 3.5KB(2K x 14)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2.3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 17x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
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PIC16(L)F1512/3
DS41624B-page 186
Preliminary
2012 Microchip Technology Inc.
20.2
SPI Mode Overview
The Serial Peripheral Interface (SPI) bus is a
synchronous serial data communication bus that
operates in Full Duplex mode. Devices communicate in
a master/slave environment where the master device
initiates the communication. A slave device is
controlled through a Chip Select known as Slave
Select.
The SPI bus specifies four signal connections:
Serial Clock (SCK)
Serial Data Out (SDO)
Serial Data In (SDI)
Slave Select (SS)
Figure 20-1 shows the block diagram of the MSSP
module when operating in SPI Mode.
The SPI bus operates with a single master device and
one or more slave devices. When multiple slave
devices are used, an independent Slave Select
connection is required from the master device to each
slave device.
Figure 20-4 shows a typical connection between a
master device and multiple slave devices.
The master selects only one slave at a time. Most slave
devices have tri-state outputs so their output signal
appears disconnected from the bus when they are not
selected.
Transmissions involve two shift registers, eight bits in
size, one in the master and one in the slave. With either
the master or the slave device, data is always shifted
out one bit at a time, with the Most Significant bit (MSb)
shifted out first. At the same time, a new Least
Significant bit (LSb) is shifted into the same register.
Figure 20-5 shows a typical connection between two
processors configured as master and slave devices.
Data is shifted out of both shift registers on the
programmed clock edge and latched on the opposite
edge of the clock.
The master device transmits information out on its SDO
output pin which is connected to, and received by, the
slave’s SDI input pin. The slave device transmits
information out on its SDO output pin, which is
connected to, and received by, the master’s SDI input
pin.
To begin communication, the master device first sends
out the clock signal. Both the master and the slave
devices should be configured for the same clock
polarity.
The master device starts a transmission by sending out
the MSb from its shift register. The slave device reads
this bit from that same line and saves it into the LSb
position of its shift register.
During each SPI clock cycle, a full duplex data
transmission occurs. This means that while the master
device is sending out the MSb from its shift register (on
its SDO pin) and the slave device is reading this bit and
saving it as the LSb of its shift register, that the slave
device is also sending out the MSb from its shift register
(on its SDO pin) and the master device is reading this
bit and saving it as the LSb of its shift register.
After 8 bits have been shifted out, the master and slave
have exchanged register values.
If there is more data to exchange, the shift registers are
loaded with new data and the process repeats itself.
Whether the data is meaningful or not (dummy data),
depends on the application software. This leads to
three scenarios for data transmission:
Master sends useful data and slave sends dummy
data.
Master sends useful data and slave sends useful
data.
Master sends dummy data and slave sends useful
data.
Transmissions may involve any number of clock
cycles. When there is no more data to be transmitted,
the master stops sending the clock signal and it
deselects the slave.
Every slave device connected to the bus that has not
been selected through its slave select line must
disregard the clock and transmission signals and must
not transmit out any data of its own.
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