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ST72754 bảng dữ liệu(PDF) 18 Page - STMicroelectronics

tên linh kiện ST72754
Giải thích chi tiết về linh kiện  8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
PDF  144 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST72754 bảng dữ liệu(HTML) 18 Page - STMicroelectronics

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3 CLOCKS, RESET, INTERRUPTS & LOW POWER MODES
3.1 CLOCK SYSTEM
3.1.1 General Description
The MCU accepts either a crystal or an external
clock signal to drive the internal oscillator. The
internal clock (CPU CLK running at fCPU) is
derived from the external oscillator frequency
(fOSC), which is divided by 3. Depending on the
external quartz or clock frequency, a division factor
of 2 is optionally added to generate the 12 MHz
clock for the Sync Processor (clamp function) as
shown in Figure 7 and a second divider by 2 for the
6MHz USB clock.
The CPU clock is used also as clock for the
ST727x4 peripherals.
Note: In the Sync processor, an additional divider
by two is added in fast mode (same external timing
for this peripheral).
Figure 7. Clock divider chain
%3
12 MHz
(Sync processor Clampout signal)
fCPU: 4 or 8 MHz
(CPU and peripherals)
OSC
12 MHz
%2
FAST
or
24MHz
FAST=1 for 24MHZ oscillator
FAST=0 for 12 MHz oscillator
%2
6 MHz
(USB)
12 MHz
or
24MHz
(TMU)
4



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