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参数资料
| 型号： | ST62P20CN1/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | PLASTIC, SSOP-20 |
| 文件页数： | 16/104页 |
| 文件大小： | 1487K |
| 代理商： | ST62P20CN1/XXX |
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5 CLOCKS, SUPPLY AND RESET
5.1 CLOCK SYSTEM
The main oscillator of the MCU can be driven by
any of these clock sources:
– external clock signal
– external AT-cut parallel-resonant crystal
– external ceramic resonator
– external RC network (RNET).
In addition, an on-chip Low Frequency Auxiliary
Oscillator (LFAO) is available as a back-up clock
system or to reduce power consumption.
An optional Oscillator Safeguard (OSG) filters
spikes from the oscillator lines, and switches to the
LFAO backup oscillator in the event of main oscil-
lator failure. It also automatically limits the internal
clock frequency (fINT) as a function of VDD, in order
to guarantee correct operation. These functions
are illustrated in Figure 10, and Figure 11.
Table 6 illustrates various possible oscillator con-
figurations using an external crystal or ceramic
resonator, an external clock input, an external re-
sistor (RNET), or the lowest cost solution using only
the LFAO.
For more details on configuring the clock options,
refer to the Option Bytes section of this document.
The internal MCU clock frequency (fINT) is divided
by 12 to drive the Timer, the Watchdog timer and
the A/D converter, by 13 to drive the CPU core and
the SPI and by 1 or 3 to drive the ARTIMER, as
shown in Figure 9.
With an 8 MHz oscillator, the fastest CPU cycle is
therefore 1.625s.
A CPU cycle is the smallest unit of time needed to
execute any operation (for instance, to increment
the Program Counter). An instruction may require
two, four, or five CPU cycles for execution.
Figure 9. Clock Circuit Block Diagram
MAIN
OSCILLATOR
OSG
LFAO
CORE
: 13
: 12
8-BIT TIMER
WATCHDOG
fINT
OSCOFF BIT
ADC
0
1
filtering
OSCILLATOR SAFEGUARD (OSG)
OSG ENABLE OPTION BIT (See OPTION BYTE SECTION)
(ADCR REGISTER)
fOSC
* Depending on device. See device summary on page 1.
*
Oscillator
Divider
SPI
: 1
: 3
8-BIT ARTIMER
1
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