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参数资料
型号： ST72T121J4B3S
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP42
封装： 0.600 INCH, PLASTIC, SDIP-42
文件页数： 16/93页
文件大小： 1374K
代理商： ST72T121J4B3S
23/93
ST72E121 ST72T121
4.5 MISCELLANEOUS REGISTER
The Miscellaneous register allows to select the
SLOW operating mode, the polarity of external in-
terrupt requests and to output the internal clock.
Register Address: 0020h
—
Read /Write
Reset Value: 0000 0000 (00h)
Bit 7:6 = PEI[3:2] External Interrupt EI3 and EI2
Polarity Options.
These bits are set and cleared by software. They
determine which event on EI2 and EI3 causes the
external interrupt according to Table 6.
Table 6. EI2 and EI3 External Interrupt Polarity
Options
Note: Any modification of one of these two bits re-
sets the interrupt request related to this interrupt
vector.
Bit 5 = MCO Main Clock Out
This bit is set and cleared by software. When set, it
enables the output of the Internal Clock on the
PPF0 I/O port.
0 - PF0 is a general purpose I/O port.
1 - MCO alternate function (fCPU is output on PF0
pin).
Bit 4:3 = PEI[1:0] External Interrupt EI1 and EI0
Polarity Options.
These bits are set and cleared by software. They
determine which event on EI0 and EI1 causes the
external interrupt according to Table 7.
Table 7. EI0 and EI1 External Interrupt Polarity
Options
Note: Any modification of one of these two bits re-
sets the interrupt request related to this interrupt
vector.l
Bit 2:1 = PSM[1:0] Prescaler for Slow Mode.
These bits are set and cleared by software. They
determine the CPU clock when the SMS bit is set
according to the following table.
Table 8. fCPU Value in Slow Mode
Bit 0 = SMS Slow Mode Select
This bit is set and cleared by software.
0: Normal Mode - fCPU = fOSC/ 2
(Reset state)
1: Slow Mode - the fCPU value is determined by the
PSM[1:0] bits.
70
PEI3 PEI2 MCO PEI1 PEI0 PSM1
PSM0 SMS
MODE
PEI3
PEI2
Falling edge and low level
(Reset state)
00
Falling edge only
1
0
Rising edge only
0
1
Rising and falling edge
1
MODE
PEI1
PEI0
Falling edge and low level
(Reset state)
00
Falling edge only
1
0
Rising edge only
0
1
Rising and falling edge
1
fCPU Value
PSM1
PSM0
fOSC / 4
0
fOSC / 16
0
1
fOSC / 8
1
0
fOSC / 32
1
23
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相关代理商/技术参数
参数描述
ST72T121J4B6 功能描述:8位微控制器 -MCU OTP EPROM 16K SPI/SC RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72T121J4T6 功能描述:8位微控制器 -MCU OTP EPROM 16K SPI/SC RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72T121J4T6S 制造商:STMicroelectronics 功能描述:
ST72T141K2B6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ST72T141K2M6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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