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| 型号： | ST52F510GmB6 |
| 厂商： | 意法半导体 |
| 英文描述： | 8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| 中文描述： | 8位重症监护病房智能控制单元两个定时器/的PWM，模数转换器，I2C，SPI和脊髓损伤 |
| 文件页数： | 44/106页 |
| 文件大小： | 1340K |
| 代理商： | ST52F510GMB6 |
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ST52F510/F513/F514
44/106
6 CLOCK, RESET & POWER SAVING MODES
6.1 Clock
The
module generates the internal clock for the internal
Control Unit, ALU and on-chip peripherals. The
Clock is designed to require a minimum of external
components.
ST52F510/F513/F514 devices supply the internal
oscillator in four clock modes:
I
External oscillator
I
External clock
I
External RC oscillator
I
Internal clock
The device always starts in internal clock mode,
excluding any external clock source. After the
start-up phase the clock is configured according to
the user definition programmed in the Option Byte
0 (OSC_CR). The internal clock generator can
supply an internal clock signal with a fixed
frequency of 10 MHz ± 1%, without the need for
external components. In order to obtain the
maximum accuracy, the frequency can be
calibrated by configuring the related Option byte 2
(OSC_SET).
The external oscillator mode uses a quartz crystal
or a ceramic resonator connected to OSCin and
OSCout as illustrated in Figure 6.1. This figure also
illustrates the connection of an external clock.
The
ST52F510/F513/F514
generates an internal clock signal with the same
period and phase as the OSCIN input pin. The
maximum frequency allowed is 24 MHz.
When the external oscillator is used, the loop gain
can be adapted to the various frequencies values
by configuring the three bits of the Option Byte 1
CLK_SET (see Register Decription, Table 6.2).
When an external clock is used, it must be
connected to the pin OSCIN while OSCOUT can
ST52F510/F513/F514
Clock
Generator
oscillator
circuit
be floating. In this case, Option Byte 1 bits must be
written with 0 (000).
The crystal oscillator start-up time is a function of
many variables: crystal parameters (especially
R
s
),
oscillator
load
parameters, environment temperature and supply
voltage.
The crystal or ceramic leads and circuit
connections must be as short as possible. Typical
values for CL1, CL2 are 10pF for a 20 MHz crystal.
The clock signal can also be generated by an
external RC circuit offering additional cost savings.
Figure 6.1 illustrates the possible connections.
Frequency is a function of resistor, capacitance,
supply voltage and operating temperature; some
indicative values when Vdd=5V and T=25°, are
shown in Table 6.1.
The clock signal generates two internal clock
signals: one for the CPU and one for the
peripherals. The CPU clock frequency can be
reduced, in order to decrease current consuption,
by setting the CPU_CLK Configuration Register 46
(02Eh). The CPU clock can be reduced up to 64
times (see Register Description).
capacitance
(CL),
IC
Figure 6.1 Oscillator Connections
OSCin
OSCout
ST FIVE
OSCin
ST FIVE
OSCout
CRYSTAL CLOCK
EXTERNAL CLOCK
Cl1
10pF
Cl2
10pF
CLOCK
INPUT
OSCin
ST FIVE
OSCout
RC CIRCUIT CLOCK
Vdd
Vss
R
C
Table 6.1 RC Oscillator indicative frequencies
C (pF)
R(
)
f
osc
(KHz)
Variation
20 pF
9.5K
5000
6.6%
10K
4870
7.1%
20K
3000
5.3%
50K
1360
3.3%
100K
724
2.8%
100 pF
10K
1720
7.5%
20K
926
8%
50K
424
11.2%
100K
248
15%
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST52F510GMM6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F510YMM6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F513 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F513FMB6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F513FMM6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
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