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| 型号： | ST622XC-KIT |
| 英文描述： | STARTER KIT DATASHEET FOR ST620X. ST621X AND ST622X |
| 中文描述： | 入门套件部件的ST620X。 ST621X及ST622X |
| 文件页数： | 56/84页 |
| 文件大小： | 969K |
| 代理商： | ST622XC-KIT |
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ST62T28C/E28C
4.6 SERIAL PERIPHERAL INTERFACE (SPI)
The on-chip SPI is an optimized serial synchro-
nous interface that supports a wide range of indus-
try standard SPI specifications. The on-chip SPI is
controlled by small and simple user software to
perform serial data exchange. The serial shift
clock can be implemented either by software (us-
ing the bit-set and bit-reset instructions), with the
on-chip Timer 1 by externally connecting the SPI
clock pin to the timer pin or by directly applying an
external clock to the Scl line.
The peripheral is composed by an 8-bit Data/shift
Register and a 4-bit binary counter while the Sin
pin is the serial shift input and Sout is the serial
shift output. These two lines can be tied together
to implement two wires protocols (I2C-bus, etc).
When data is serialized, the MSB is the first bit. Sin
has to be programmed as input. For serial output
operation Sout has to be programmed as open-
drain output.
The SCL, Sin and Sout SPI clock and data signals
are connected to 3 I/O lines on the same external
pins. With these 3 lines, the SPI can operate in the
following operating modes: Software SPI, S-BUS,
I2C-bus and as a standard serial I/O (clock, data,
enable). An interrupt request can be generated af-
ter eight clock pulses.
Figure 34
shows the SPI
block diagram.
The SCL line clocks, on the falling edge, the shift
register and the counter. To allow SPI operation in
slave mode, the SCL pin must be programmed as
input and an external clock must be supplied to
this pin to drive the SPI peripheral.
WARNING
: In all cases, in both slave and master
mode, the SCL pin must always be configured as
input (Reset state).
In master mode, the SCL signal must be generat-
ed by software and output on another free I/O port
pin which must be connected externally to the SCL
input pin.
Figure 34. SPI Block Diagram
Set Res
CLK
RESET
4-Bit Counter
(Q4=High after Clock8)
Data Reg
Direction
I/O Port
8-Bit Data
Shift Register
Reset
Load
DOUT
Output
Enable
8-Bit Tristate Data I/O
RESET
I/O Port
I/O Port
CP
CP
DIN
D0............................D7
to Processor Data Bus
Q4
Q4
OPR Reg.
DIN
SCL
Sin
Sout
SPI Interrupt Disable Register
SPI Data Register
Data Reg
Direction
Data Reg
Direction
DOUT
Write
Read
M
0
1
Interrupt
VR01504
56
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| ST62E40BG1 | 8-BIT MICROCONTROLLER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST622XC-KIT/110 | 功能描述:开发板和工具包 - 其他处理器 ST622X Starter Kit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| ST622XC-KIT/UK | 制造商:STMicroelectronics 功能描述:ST620 ST621 RS232 STARTER KIT |
| ST6230 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8/16-Bit Micros |
| ST6230B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. A/D CONVERTER. 16-BIT AUTO-RELOAD TIMER. EEPROM. SPI. UART AND 28 PINS |
| ST6230BB1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, 16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART |
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