参数资料
型号: ST7PL38F2MC/XXXE
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-20
文件页数: 141/168页
文件大小: 2955K
代理商: ST7PL38F2MC/XXXE
Obsolete
Product(s)
- Obsolete
Product(s)
ST7L34, ST7L35, ST7L38, ST7L39
74/168
ON-CHIP PERIPHERALS (cont’d)
11.4 SERIAL PERIPHERAL INTERFACE (SPI)
11.4.1 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 or a system in
which devices may be either masters or slaves.
11.4.2 Main Features
Full duplex synchronous transfers (on three
lines)
Simplex synchronous transfers (on two lines)
Master or slave operation
6 master mode frequencies (fCPU/4 max.)
fCPU/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.
11.4.3 General Description
Figure 48 on page 75 shows the serial peripheral
interface (SPI) block diagram. There are three reg-
isters:
– SPI Control Register (SPICR)
– SPI Control/Status Register (SPICSR)
– SPI Data Register (SPIDR)
The SPI is connected to external devices through
four 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 Device.
1
相关PDF资料
PDF描述
ST7PL38F2UCXXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7PL39F2MA/XXXE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
ST7L38F2UC/XXXE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
ST7FL38F2UATRE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, QCC20
ST7PL35F2MAXXXRE 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
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