參數(shù)資料
型號(hào)： ST72T2311R7T6
廠商： 意法半導(dǎo)體
英文描述： 8-BIT MCU WITH NESTED INTERRUPTS, EEPROM, ADC, 16-BIT TIMERS, 8-BIT PWM ART, SPI, SCI, CAN INTERFACES
中文描述： 8位嵌套中斷，EEPROM存儲(chǔ)器，模數(shù)轉(zhuǎn)換器，16位定時(shí)器，8位PWM藝術(shù)，SPI和脊髓損傷，微控制器的CAN接口
文件頁數(shù)： 113/164頁
文件大?。?/td> 1043K
代理商： ST72T2311R7T6
ST72311R, ST72511R, ST72512R, ST72532R
52/164
10.2 MAIN CLOCK CONTROLLER WITH REAL TIME CLOCK TIMER (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 7.2 ”SLOW MODE” on page 34 for more
details).
The prescaler selects the fCPU main clock frequen-
cy and is controlled by three bits in the MISCR1
register: CP[1:0] and SMS.
CAUTION: The prescaler does not act on the CAN
peripheral clock source. This peripheral is always
supplied by the fOSC/2 clock source.
10.2.2 Clock-out Capability
The clock-out capability is an alternate function of
an I/O port pin that outputs a fOSC/2 clock to drive
external devices. It is controlled by the MCO bit in
the MISCR1 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 fOSC are available. The whole func-
tionality is controlled by four bits of the MCCSR
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 7.4
”ACTIVE-HALT AND HALT MODES” on page 36
for more details.
Figure 29. Main Clock Controller (MCC/RTC) Block Diagram
DIV2,4,8,16
MCC/RTC INTERRUPT
DIV 2
SMS
CP1 CP0
TB1 TB0 OIE OIF
CPU CLOCK
MISCR1
RTC
COUNTER
CLOCK TO CAN
TO CPU AND
PERIPHERALS
fOSC
fCPU
MCO
PORT
FUNCTION
ALTERNATE
MCO
-
0
MCCSR
fOSC/2
PERIPHERAL
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ST72T251G2M6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI/I2C 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
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