参数资料
型号: ST72T734J6B1
厂商: 意法半导体
元件分类: ADC
英文描述: 8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
中文描述: 8位USB单片机的显示器,高达60K章检察官办公室,每1000内存,模数转换器,定时器,同步,材质单元,脉宽调制/的BRM,的H / W DDC的
文件页数: 55/144页
文件大小: 1280K
代理商: ST72T734J6B1
ST72774/ST727754/ST72734
18/144
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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