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參數(shù)資料
| 型號： | COP8SAA728M9 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS ROM Based and One-Time Programmable OTP Microcontroller with 1k to 4k Memory, Power On Reset, and Very Small Packaging |
| 中文描述： | 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 21/60頁 |
| 文件大?。?/td> | 787K |
| 代理商： | COP8SAA728M9 |
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7.0 Timers
(Continued)
the PMW outputs are useful in controlling motors, triacs, the
intensity of displays, and in providing inputs for data acquisi-
tion and sine wave generators.
In this mode, the timer T1 counts down at a fixed rate of t
C
.
Upon every underflow the timer is alternately reloaded with
the contents of supporting registers, R1A and R1B. The very
first underflow of the timer causes the timer to reload from
the register R1A. Subsequent underflows cause the timer to
be reloaded from the registers alternately beginning with the
register R1B.
The T1 Timer control bits, T1C3, T1C2 and T1C1 set up the
timer for PWM mode operation.
Figure 15shows a block diagram of the timer in PWM mode.
The underflows can be programmed to toggle the T1Aoutput
pin. The underflows can also be programmed to generate in-
terrupts.
Underflows from the timer are alternately latched into two
pending flags, T1PNDA and T1PNDB. The user must reset
these pending flags under software control. Two control en-
able flags, T1ENA and T1ENB, allow the interrupts from the
timer underflow to be enabled or disabled. Setting the timer
enable flag T1ENA will cause an interrupt when a timer un-
derflow causes the R1A register to be reloaded into the
timer. Setting the timer enable flag T1ENB will cause an in-
terrupt when a timer underflow causes the R1B register to be
reloaded into the timer. Resetting the timer enable flags will
disable the associated interrupts.
Either or both of the timer underflow interrupts may be en-
abled. This gives the user the flexibility of interrupting once
per PWM period on either the rising or falling edge of the
PWM output. Alternatively, the user may choose to interrupt
on both edges of the PWM output.
7.2.2 Mode 2. External Event Counter Mode
This mode is quite similar to the processor independent
PWM mode described above. The main difference is that the
timer, T1, is clocked by the input signal from the T1Apin. The
T1 timer control bits, T1C3, T1C2 and T1C1 allow the timer
to be clocked either on a positive or negative edge from the
T1A pin. Underflows from the timer are latched into the
T1PNDA pending flag. Setting the T1ENA control flag will
cause an interrupt when the timer underflows.
In this mode the input pin T1B can be used as an indepen-
dent positive edge sensitive interrupt input if the T1ENB con-
trol flag is set. The occurrence of a positive edge on the T1B
input pin is latched into the T1PNDB flag.
Figure 16 shows a block diagram of the timer in External
Event Counter mode.
Note:
The PWM output is not available in this mode since the T1A pin is be-
ing used as the counter input clock.
DS012838-22
FIGURE 15. Timer in PWM Mode
DS012838-23
FIGURE 16. Timer in External Event Counter Mode
www.national.com
21
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| COP8SAA728N8 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| COP8SAA728N9 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| COP8SAA7SLB8 | 功能描述:IC MCU OTP 8BIT 1K 28LAMINATECSP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:COP8™ 8SA 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| COP8SAA7SLB9 | 功能描述:IC MCU OTP 8BIT 1K 28LAMINATECSP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:COP8™ 8SA 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| COP8SAB5 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit CMOS ROM Based and One-Time Programmable OTP Microcontroller with 1k to 4k Memory, Power On Reset, and Very Small Packaging |
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