參數(shù)資料
型號: ST72F324J6
英文描述: 8-BIT MCU WITH NESTED INTERRUPTS. FLASH. 10-BIT ADC. 4 TIMERS. SPI. SCI INTERFACE
中文描述: 8位微控制器嵌套中斷。閃光。 10位ADC。 4定時器。的SPI。 SCI接口
文件頁數(shù): 138/161頁
文件大?。?/td> 2070K
代理商: ST72F324J6
ST72324
78/161
10.4 SERIAL PERIPHERAL INTERFACE (SPI)
10.4.1 Introduction
The Serial Peripheral Interface (SPI) allows full-
duplex, synchronous, serial communication with
external devices. An SPI system may consist of a
master and one or more slaves however the SPI
interface can not be a master in a multi-master
system.
10.4.2 Main Features
s
Full duplex synchronous transfers (on 3 lines)
s
Simplex synchronous transfers (on 2 lines)
s
Master or slave operation
s
Six master mode frequencies (fCPU/4 max.)
s
fCPU/2 max. slave mode frequency
s
SS Management by software or hardware
s
Programmable clock polarity and phase
s
End of transfer interrupt flag
s
Write collision, Master Mode Fault and Overrun
flags
10.4.3 General Description
Figure 47 shows the serial peripheral interface
(SPI) block diagram. There are 3 registers:
– SPI Control Register (SPICR)
– SPI Control/Status Register (SPICSR)
– SPI Data Register (SPIDR)
The SPI is connected to external devices through
3 pins:
– MISO: Master In / Slave Out data
– MOSI: Master Out / Slave In data
– SCK: Serial Clock out by SPI masters and in-
put by SPI slaves
–SS: Slave select:
This input signal acts as a ‘chip select’ to let
the SPI master communicate with slaves indi-
vidually and to avoid contention on the data
lines. Slave SS inputs can be driven by stand-
ard I/O ports on the master MCU.
Figure 47. Serial Peripheral Interface Block Diagram
SPIDR
Read Buffer
8-Bit Shift Register
Write
Read
Data/Address Bus
SPI
SPIE
SPE
MSTR
CPHA
SPR0
SPR1
CPOL
SERIAL CLOCK
GENERATOR
MOSI
MISO
SS
SCK
CONTROL
STATE
SPICR
SPICSR
Interrupt
request
MASTER
CONTROL
SPR2
0
7
0
7
SPIF WCOL
MODF
0
OVR
SSI
SSM
SOD
bit
SS
1
0
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ST72F324J6B5 功能描述:8位微控制器 -MCU Flask 32K SPI/SCI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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