參數(shù)資料
型號： ST72124J2T
廠商： 意法半導體
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
中文描述： 8位單電壓閃存，ADC和16位定時器，SPI和脊髓損傷界面微控制器
文件頁數(shù)： 52/153頁
文件大小： 1533K
代理商： ST72124J2T
ST72334J/N, ST72314J/N, ST72124J
52/153
14.2 MAIN CLOCK CONTROLLER WITH REAL TIME CLOCK TIMER (MCC/RTC)
The Main Clock Controller consists of three differ-
ent functions:
I
a programmable CPU clock prescaler
I
a clock-out signal to supply external devices
I
a real time clock timer with interrupt capability
Each function can be used independently and si-
multaneously.
14.2.1 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 11.2 "SLOW MODE" on page 35
for more
details).
The prescaler selects the f
CPU
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 f
OSC
/2 clock source.
14.2.2 Clock-out capability
The clock-out capability is an alternate function of
an I/O port pin that outputs a f
OSC
/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.
14.2.3 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 f
OSC
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 11.4
"ACTIVE-HALT AND HALT MODES" on page 37
for more details.
Figure 30. Main Clock Controller (MCC/RTC) Block Diagram
DIV 2, 4, 8, 16
MCC/RTC INTERRUPT
DIV 2
SMS
CP1 CP0
TB1
TB0
OIE
OIF
CPU CLOCK
TO CPU AND
PERIPHERALS
MISCR1
RTC
COUNTER
f
OSC
f
CPU
MCO
PORT
FUNCTION
ALTERNATE
MCO
-
-
-
-
0
0
0
0
MCCSR
f
OSC
/2
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參數(shù)描述
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ST72124J2T1/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, SCI INTERFACES
ST72124J2T3 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, SCI INTERFACES
ST72124J2T3/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, SCI INTERFACES
ST72124J2T6 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, SCI INTERFACES
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