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參數(shù)資料
| 型號： | ST92P141K4B6/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | PLASTIC, SDIP-32 |
| 文件頁數(shù)： | 140/179頁 |
| 文件大小： | 1905K |
| 代理商： | ST92P141K4B6/XXX |
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ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU)
5 RESET AND CLOCK CONTROL UNIT (RCCU)
5.1 INTRODUCTION
The Reset and Clock Control Unit (RCCU) com-
prises two distinct sections:
– the Clock Control Unit, which generates and
manages the internal clock signals.
– the Reset/Stop Manager, which detects and
flags Hardware, Software and Watchdog gener-
ated resets.
In Stop mode and Halt mode, all oscillators are fro-
zen in order to achieve the lowest possible power
consumption.
Entering and exiting Stop mode is controlled by
the WUIMU.
Halt mode is entered by executing the HALT in-
struction. Halt mode can only be exited by a reset
event.
5.2 CLOCK CONTROL UNIT
The Clock Control Unit generates the internal
clocks for the CPU core (CPUCLK) and for the on-
chip peripherals (INTCLK). The Clock Control Unit
may be driven by an external crystal circuit, con-
nected to the OSCIN and OSCOUT pins, or by an
external pulse generator, connected to OSCIN
(see Figure 34 and Figure 36). If present, another
clock source named CK_AF can be provided to
the system. Depending on the device, it can be a
periodic signal applied to the CK_AF pin or a sig-
nal generated internally by the MCU (RC oscilla-
tor).
5.2.1 Clock Control Unit Overview
As shown in Figure 26, a programmable divider
can divide the CLOCK1 input clock signal by two.
The resulting signal, CLOCK2, is the reference in-
put clock to the programmable Phase Locked
Loop frequency multiplier, which is capable of mul-
tiplying the clock frequency by a factor of 6, 8, 10
or 14; the multiplied clock is then divided by a pro-
grammable divider, by a factor of 1 to 7. By this
means, the ST9 can operate with cheaper, medi-
um frequency (3-5 MHz) crystals, while still provid-
ing a high frequency internal clock for maximum
system performance; the range of available multi-
plication and division factors allow a great number
of operating clock frequencies to be derived from a
single crystal frequency. The undivided PLL clock
is also available for special purposes (high-speed
peripheral).
For low power operation, especially in Wait for In-
terrupt mode, the Clock Multiplier unit may be
turned off, whereupon the output clock signal may
be programmed as CLOCK2 divided by 16. Fur-
thermore, during the execution of a WFI in Low
Power mode, the CK_AF clock is automatically di-
vided by 16 for further consumption reduction. (for
the selection of this signal refer to the description
the CK_AF clock source in the following sections
of this chapter).
The internal system clock, INTCLK, is routed to all
on-chip peripherals, as well as to the programma-
ble Clock Prescaler Unit which generates the clock
for the CPU core (CPUCLK).
The Clock Prescaler is programmable and can
slow the CPU clock by a factor of up to 8, allowing
the programmer to reduce CPU processing speed,
and thus power consumption, while maintaining a
high speed clock to the peripherals. This is partic-
ularly useful when little actual processing is being
done by the CPU and the peripherals are doing
most of the work.
Figure 26. Clock Control Unit Simplified Block Diagram
Quartz
CK_AF
1/16
1/2
oscillator
pin
CLOCK2
CLOCK1
CK_AF
PLL
Clock Multiplier
CPU Clock
Prescaler
to
CPU Core
to
Peripherals
CPUCLK
INTCLK
Unit
/Divider
1/16
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST92T141K4M6 | 16-BIT, OTPROM, 25 MHz, MICROCONTROLLER, PDSO34 |
| ST92R195C9 | 16-BIT, 24 MHz, MICROCONTROLLER, PQFP80 |
| STA2058 | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP64 |
| STCD1020RDG6E | PLL BASED CLOCK DRIVER, PDSO8 |
| STCD23300F35F | 2330 SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PBGA12 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST92T141K4B6 | 功能描述:8位微控制器 -MCU OTP EPROM 16K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ST92T141K4M6 | 功能描述:8位微控制器 -MCU OTP EPROM 16K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ST92T163R4T1 | 功能描述:8位微控制器 -MCU OTP EPROM 20K USB/I2 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ST92T196/JAP | 制造商:STMicroelectronics 功能描述: |
| ST92T96N9B1/AIN | 制造商:STMicroelectronics 功能描述: |
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