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參數(shù)資料
| 型號(hào)： | COP8SCR9IMT7 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout |
| 中文描述： | 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PDSO48 |
| 封裝： | TSSOP-48 |
| 文件頁數(shù)： | 40/80頁 |
| 文件大?。?/td> | 972K |
| 代理商： | COP8SCR9IMT7 |
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13.0 Power Saving Features
(Continued)
13.3.2 High Speed Idle Mode
In the IDLE mode, program execution stops and power
consumption is reduced to a very low level as with the HALT
mode. However, the high speed oscillator, IDLE Timer (Timer
T0), and Clock Monitor continue to operate, allowing real
time to be maintained. The device remains idle for a selected
amount of time up to 65,536 instruction cycles, or 32.768
milliseconds with a 2 MHz instruction clock frequency, and
then automatically exits the IDLE mode and returns to nor-
mal program execution.
The device is placed in the IDLE mode under software
control by setting the IDLE bit (bit 6 of the Port G data
register).
The IDLE Timer window is selectable from one of five values,
4k, 8k, 16k, 32k or 64k instruction cycles. Selection of this
value is made through the ITMR register.
The IDLE mode uses the on-chip IDLE Timer (Timer T0) to
keep track of elapsed time in the IDLE state. The IDLE Timer
runs continuously at the instruction clock rate, whether or not
the device is in the IDLE mode. Each time the bit of the timer
associated with the selected window toggles, the T0PND bit
is set, an interrupt is generated (if enabled), and the device
exits the IDLE mode if in that mode. If the IDLE Timer
interrupt is enabled, the interrupt is serviced before execu-
tion of the main program resumes. (However, the instruction
which was started as the part entered the IDLE mode is
completed before the interrupt is serviced. This instruction
should be a NOP which should follow the enter IDLE instruc-
tion.) The user must reset the IDLE Timer pending flag
(T0PND) before entering the IDLE mode.
As with the HALT mode, this device can also be returned to
normal operation with a reset, or with a Multi-Input Wake-up
input. Upon reset the ITMR register is cleared and the ITMR
register selects the 4,096 instruction cycle tap of the Idle
Timer.
The IDLE Timer cannot be started or stopped under software
control, and it is not memory mapped, so it cannot be read or
written by the software. Its state upon Reset is unknown.
Therefore, if the device is put into the IDLE mode at an
arbitrary time, it will stay in the IDLE mode for somewhere
between 1 and the selected number of instruction cycles.
In order to precisely time the duration of the IDLE state, entry
into the IDLE mode must be synchronized to the state of the
IDLE Timer. The best way to do this is to use the IDLE Timer
interrupt, which occurs on every underflow of the bit of the
IDLE Timer which is associated with the selected window.
Another method is to poll the state of the IDLE Timer pending
bit T0PND, which is set on the same occurrence. The Idle
Timer interrupt is enabled by setting bit T0EN in the ICNTRL
register.
Any time the IDLE Timer window length is changed there is
the possibility of generating a spurious IDLE Timer interrupt
by setting the T0PND bit. The user is advised to disable
IDLE Timer interrupts prior to changing the value of the
ITSEL bits of the ITMR Register and then clear the TOPND
bit before attempting to synchronize operation to the IDLE
Timer.
Note:
As with the HALT mode, it is necessary to program two
NOP’s to allow clock resynchronization upon return from the
IDLE mode. The NOP’s are placed either at the beginning of
the IDLE Timer interrupt routine or immediately following the
“enter IDLE mode” instruction.
For more information on the IDLE Timer and its associated
interrupt, see the description in the Timers section.
13.4 DUAL CLOCK MODE OPERATION
This mode of operation allows for high speed operation of
the Core clock and low speed operation of the Idle Timer.
This mode can be entered from either the High Speed mode
or the Low Speed mode.
To enter from the High Speed mode, the following sequence
must be followed:
1.
Software sets the LSON bit to 1.
2.
Software waits until the low speed oscillator has stabi-
lized. See
Table 3
.
3.
Software sets the DCEN bit to 1.
To enter from the Low Speed mode, the following sequence
must be followed:
1.
Software sets the HSON bit to 1.
2.
Software waits until the high speed oscillator has stabi-
lized. See
Table 3, Startup Times.
10138923
FIGURE 20. Wake-up from HALT
C
www.national.com
40
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| COP8SCR9IMT8 | 功能描述:IC MCU EEPROM 8BIT 32K 48-TSSOP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:COP8™ 8S 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| COP8SCR9KMT7 | 功能描述:IC MCU EEPROM 8BIT 32K 56-TSSOP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:COP8™ 8S 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
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| COP8SCR9LVA7 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout |
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