參數(shù)資料
型號： ST72F324B
廠商： 意法半導(dǎo)體
英文描述： 5V Range 8-Bit MCU With 8 TO 32K FLASH/ROM, 10-Bit ADC, 4 Timers, SPI, SCI Interface(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
中文描述： 5V范圍內(nèi)的8位8到32K閃存/ ROM，10位ADC，4個計時器，SPI和SCI接口（具有比較方案，國際檢察官聯(lián)合會，嵌套中斷，中華語文研習(xí)所，人事登記的8位微控制器）
文件頁數(shù)： 78/167頁
文件大小： 1641K
代理商： ST72F324B
ST72324B
78/167
1
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
■
Full duplex synchronous transfers (on 3 lines)
■
Simplex synchronous transfers (on 2 lines)
■
Master or slave operation
■
Six master mode frequencies (f
CPU
/4 max.)
■
f
CPU
/2 max. slave mode frequency (see note)
■
SS Management by software or hardware
■
Programmable clock polarity and phase
■
End of transfer interrupt flag
■
Write collision, Master Mode Fault and Overrun
flags
Note:
In slave mode, continuous transmission is
not possible at maximum frequency due to the
software overhead for clearing status flags and to
initiate the next transmission sequence.
10.4.3 General Description
Figure 46
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
4 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
Figure 46. Serial Peripheral Interface Block Diagram
SPIDR
Read Buffer
8-Bit Shift Register
Write
Read
Data/Address Bus
SPI
STATE
SPIE
SPE
MSTR
CPHA
SPR0
SPR1
CPOL
SERIAL CLOCK
GENERATOR
MOSI
MISO
SS
SCK
CONTROL
SPICR
SPICSR
Interrupt
request
MASTER
CONTROL
SPR2
0
7
0
7
SPIF WCOL
MODF
0
OVR
SSI
SSM
SOD
SOD
bit
SS
1
0
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ST72F324BJ4B6 功能描述:8位微控制器 -MCU 5V RANGE 8B MCU 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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