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参数资料
型号： ST72F324K2B3
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装： 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数： 107/156页
文件大小： 1012K
代理商： ST72F324K2B3
ST72324J/K
54/156
10.2 MAIN CLOCK CONTROLLER WITH REAL TIME CLOCK AND BEEPER (MCC/RTC)
The Main Clock Controller consists of three differ-
ent functions:
s
a programmable CPU clock prescaler
s
a clock-out signal to supply external devices
s
a real time clock timer with interrupt capability
Each function can be used independently and si-
multaneously.
10.2.1 Programmable CPU Clock Prescaler
The programmable CPU clock prescaler supplies
the clock for the ST7 CPU and its internal periph-
erals. It manages SLOW power saving mode (See
Section 8.2 SLOW MODE for more details).
The prescaler selects the fCPU main clock frequen-
cy and is controlled by three bits in the MCCSR
register: CP[1:0] and SMS.
10.2.2 Clock-out Capability
The clock-out capability is an alternate function of
an I/O port pin that outputs a fOSC2 clock to drive
external devices. It is controlled by the MCO bit in
the MCCSR register.
CAUTION: When selected, the clock out pin sus-
pends the clock during ACTIVE-HALT mode.
10.2.3 Real Time Clock Timer (RTC)
The counter of the real time clock timer allows an
interrupt to be generated based on an accurate
real time clock. Four different time bases depend-
ing directly on fOSC2 are available. The whole
functionality is controlled by four bits of the MCC-
SR register: TB[1:0], OIE and OIF.
When the RTC interrupt is enabled (OIE bit set),
the ST7 enters ACTIVE-HALT mode when the
HALT instruction is executed. See Section 8.4 AC-
TIVE-HALT AND HALT MODES for more details.
10.2.4 Beeper
The beep function is controlled by the MCCBCR
register. It can output three selectable frequencies
on the BEEP pin (I/O port alternate function).
Figure 35. Main Clock Controller (MCC/RTC) Block Diagram
DIV 2, 4, 8, 16
MCC/RTC INTERRUPT
SMS
CP1 CP0
TB1 TB0
OIE
OIF
CPU CLOCK
MCCSR
12-BIT MCC RTC
COUNTER
TO CPU AND
PERIPHERALS
fOSC2
fCPU
MCO
BC1 BC0
MCCBCR
BEEP
GENERATOR
BEEP SIGNAL
1
0
TO
WATCHDOG
TIMER
DIV 64
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相关代理商/技术参数
参数描述
ST72F324K2B6 功能描述:8位微控制器 -MCU 5V RANGE 8B MCU 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
ST72F324K2T3 制造商:STMicroelectronics 功能描述:
ST72F324K2T3TR 制造商:STMicroelectronics 功能描述:
ST72F324K2T6 功能描述:8位微控制器 -MCU Flash 8K SPI/SCI 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
ST72F324K2T6TR 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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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