參數(shù)資料
型號： ST72215G2B1
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
中文描述： 8位單電壓閃存微控制器。 ADC的。 16位定時器。的SPI。
文件頁數(shù)： 109/140頁
文件大?。?/td> 1349K
代理商： ST72215G2B1
ST72104G, ST72215G, ST72216G, ST72254G
70/140
SERIAL PERIPHERAL INTERFACE (Cont’d)
12.3.7 Register Description
CONTROL REGISTER (CR)
Read/Write
Reset Value: 0000xxxx (0xh)
Bit 7 = SPIE
Serial peripheral interrupt enable.
This bit is set and cleared by software.
0: Interrupt is inhibited
1: An SPI interrupt is generated whenever SPIF=1
or MODF=1 in the SR register
Bit 6 = SPE
Serial peripheral output enable.
This bit is set and cleared by software. It is also
cleared by hardware when, in master mode, SS=0
(see Section 12.3.4.5 "Master Mode Fault" on
page 70).
0: I/O port connected to pins
1: SPI alternate functions connected to pins
The SPE bit is cleared by reset, so the SPI periph-
eral is not initially connected to the external pins.
Bit 5 = SPR2
Divider Enable.
this bit is set and cleared by software and it is
cleared by reset. It is used with the SPR[1:0] bits to
set the baud rate. Refer to Table 15.
0: Divider by 2 enabled
1: Divider by 2 disabled
Bit 4 = MSTR
Master.
This bit is set and cleared by software. It is also
cleared by hardware when, in master mode, SS=0
(see Section 12.3.4.5 "Master Mode Fault" on
page 70).
0: Slave mode is selected
1: Master mode is selected, the function of the
SCK pin changes from an input to an output and
the functions of the MISO and MOSI pins are re-
versed.
Bit 3 = CPOL
Clock polarity.
This bit is set and cleared by software. This bit de-
termines the steady state of the serial Clock. The
CPOL bit affects both the master and slave
modes.
0: The steady state is a low value at the SCK pin.
1: The steady state is a high value at the SCK pin.
Bit 2 = CPHA
Clock phase.
This bit is set and cleared by software.
0: The first clock transition is the first data capture
edge.
1: The second clock transition is the first capture
edge.
Bit 1:0 = SPR[1:0]
Serial peripheral rate.
These bits are set and cleared by software.Used
with the SPR2 bit, they select one of six baud rates
to be used as the serial clock when the device is a
master.
These 2 bits have no effect in slave mode.
Table 15. Serial Peripheral Baud Rate
70
SPIE
SPE
SPR2
MSTR
CPOL
CPHA
SPR1
SPR0
Serial Clock
SPR2
SPR1
SPR0
fCPU/4
1
0
fCPU/8
0
fCPU/16
0
1
fCPU/32
1
0
fCPU/64
0
1
0
fCPU/128
0
1
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相關代理商/技術參數(shù)
參數(shù)描述
ST72215G2B1/XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES
ST72215G2B3 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
ST72215G2B3/XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES
ST72215G2B5 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
ST72215G2B5/XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES
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