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)： 141/161頁
文件大?。?/td> 2070K
代理商： ST72F324J6
ST72324
80/161
SERIAL PERIPHERAL INTERFACE (Cont’d)
10.4.3.2 Slave Select Management
As an alternative to using the SS pin to control the
Slave Select signal, the application can choose to
manage the Slave Select signal by software. This
is configured by the SSM bit in the SPICSR regis-
ter (see Figure 50)
In software management, the external SS pin is
free for other application uses and the internal SS
signal level is driven by writing to the SSI bit in the
SPICSR register.
In Master mode:
–SS internal must be held high continuously
In Slave Mode:
There are two cases depending on the data/clock
timing relationship (see Figure 49):
If CPHA=1 (data latched on 2nd clock edge):
–SS internal must be held low during the entire
transmission. This implies that in single slave
applications the SS pin either can be tied to
VSS, or made free for standard I/O by manag-
ing the SS function by software (SSM= 1 and
SSI=0 in the in the SPICSR register)
If CPHA=0 (data latched on 1st clock edge):
–SS internal must be held low during byte
transmission and pulled high between each
byte to allow the slave to write to the shift reg-
ister. If SS is not pulled high, a Write Collision
error will occur when the slave writes to the
shift register (see Section 10.4.5.3).
Figure 49. Generic SS Timing Diagram
Figure 50. Hardware/Software Slave Select Management
MOSI/MISO
Master SS
Slave SS
(if CPHA=0)
Slave SS
(if CPHA=1)
Byte 1
Byte 2
Byte 3
1
0
SS internal
SSM bit
SSI bit
SS external pin
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相關代理商/技術參數(shù)
參數(shù)描述
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 安裝風格:SMD/SMT
ST72F324J6B6 功能描述:8位微控制器 -MCU Flash 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 安裝風格:SMD/SMT
ST72F324J6T3 功能描述:8位微控制器 -MCU Flash 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 安裝風格:SMD/SMT
ST72F324J6T5 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 安裝風格:SMD/SMT
ST72F324J6T6 功能描述:8位微控制器 -MCU Flash 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 安裝風格:SMD/SMT
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