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參數(shù)資料
| 型號： | ST90R158M9LVT6 |
| 英文描述： | FUSE,5A,250V,5X20MM,FAST ACTING |
| 中文描述： | 16位產(chǎn)品微控制器（MCU），并配備16至64K的光盤。檢察官辦公室或EPROM。 512 2K的內(nèi)存- ST9家庭 |
| 文件頁數(shù)： | 69/199頁 |
| 文件大?。?/td> | 2813K |
| 代理商： | ST90R158M9LVT6 |
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ST90158 - RESET AND CLOCK CONTROL UNIT (RCCU)
CLOCK MANAGEMENT
(Cont’d)
6.3.1 PLL Clock Multiplier Programming
The CLOCK1 signal generated by the oscillator
drives a programmable divide-by-two circuit. If the
DIV2 control bit in MODER is set (Reset Condi-
tion), CLOCK2, is equal to CLOCK1 divided by
two; if DIV2 is reset, CLOCK2 is identical to
CLOCK1. Since the input clock to the Clock Multi-
plier circuit requires a 50% duty cycle for correct
PLL operation, the divide by two circuit should be
enabled when a crystal oscillator is used, or when
the external clock generator does not provide a
50% duty cycle. In practice, the divide-by-two is
virtually always used in order to ensure a 50% duty
cycle signal to the PLL multiplier circuit.
When the PLL is active, it multiplies CLOCK2 by 6,
8, 10 or 14, depending on the status of the MX0 -1
bits in PLLCONF. The multiplied clock is then di-
vided by a factor in the range 1 to 7, determined by
the status of the DX0-2 bits; when these bits are
programmed to 111, the PLL is switched off.
Following a RESET phase, programming bits
DX0-2 to a value different from 111 will turn the
PLL on. After allowing a stabilisation period for the
PLL, setting the CSU_CKSEL bit in the
CLK_FLAG Register selects the multiplier clock.
The maximum frequency allowed for INTCLK is 24
MHz for 5V operation, and 16 MHz for 3V opera-
tion. Care is required, when programming the PLL
multiplier and divider factors, not to exceed the
maximum permissible operating frequency for
INTCLK, according to supply voltage.
The ST9 being a static machine, there is no lower
limit for INTCLK. However, below 1MHz, A/D con-
verter precision (if present) decreases.
6.3.2 CPU Clock Prescaling
The system clock, INTCLK, which may be the out-
put of the PLL clock multiplier, CLOCK2, CLOCK2/
16 or CK_AF, drives a programmable prescaler
which generates the basic time base, CPUCLK,
for the instruction executer of the ST9 CPU core.
This allows the user to slow down program execu-
tion during non processor intensive routines, thus
reducing power dissipation.
The internal peripherals are not affected by the
CPUCLK prescaler and continue to operate at the
full INTCLK frequency. This is particularly useful
when little processing is being done and the pe-
ripherals are doing most of the work.
The prescaler divides the input clock by the value
programmed in the control bits PRS2,1,0 in the
MODER register. If the prescaler value is zero, no
prescaling takes place, thus CPUCLK has the
same period and phase as INTCLK. If the value is
different from 0, the prescaling is equal to the val-
ue plus one, ranging thus from two (PRS2,1,0 = 1)
to eight (PRS2,1,0 = 7).
The clock generated is shown in
Figure 33
, and it
will be noted that the prescaling of the clock does
not preserve the 50% duty cycle, since the high
level is stretched to replace the missing cycles.
This is analogous to the introduction of wait cycles
for access to external memory. When External
Memory Wait or Bus Request events occur, CPU-
CLK is stretched at the high level for the whole pe-
riod required by the function.
Figure 33. CPU Clock Prescaling
6.3.3 Peripheral Clock
The system clock, INTCLK, which may be the out-
put of the PLL clock multiplier, CLOCK2, CLOCK2/
16 or CK_AF, is also routed to all ST9 on-chip pe-
ripherals and acts as the central timebase for all
timing functions.
INTCLK
CPUCLK
VA00260
000
001
010
011
100
101
110
111
PRS VALUE
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST90R158T6 | 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| ST901 | HIGH VOLTAGE IGNITION COIL DRIVER NPN POWER DARLINGTON |
| ST901T | HIGH VOLTAGE IGNITION COIL DRIVER NPN POWER DARLINGTON |
| ST9291J7B1 | Microcontroller |
| ST9291N2B1 | Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST90R158Q6 | 功能描述:8位微控制器 -MCU ROMless SPI/2xSCI 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 |
| ST90R158T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM |
| ST90R158T6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| ST90R26B1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| ST90R26B6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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