- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄97909 > EM6604DL24A Microcontroller PDF資料下載
參數(shù)資料
| 型號： | EM6604DL24A |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 38/39頁 |
| 文件大小： | 675K |
| 代理商： | EM6604DL24A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁當前第38頁第39頁
EM6603
03/02 REV. G/439
Copyright
2002, EM Microelectronic-Marin SA
8
www.emmicroelectronic.com
4
Oscillator
A built-in crystal oscillator circuit generates the system operating clock for the CPU and peripheral circuits from an
externally connected crystal (typ. 32.768kHz) and trimmer capacitor (from Qin tw. Vss). The oscillator circuit is
supplied by the regulated voltage, Vreg. In SLEEP mode the oscillator is stopped.
With Fout bit in PA3cnt register we can put the system 32.768 Hz frequency on STB/RST pin as output.
4.1 Prescaler
The input to the prescaler is the system clock signal.
The prescaler consists of a fifteen (15) element divider
chain which delivers clock signals for the peripheral
circuits such as the timer/counter, buzzer, I/O
debouncers and edge detectors, as well as generating
prescaler interrupts.
Table 6.Prescaler interrupt source
Interrupt frequency
PSF1
PSF0
mask(no interrupt)
0
1 Hz
0
1
8 Hz
1
0
32 Hz
1
The frequency of prescaler interrupts is software selectable, as shown in Table 6.
Table 7. Prescaler control register - PRESC
Bit
Name
Reset
R/W
Description
3
MTim
0
R/W
Timer/Counter Interrupt Mask
2
PRST
-
R/W
Prescaler reset
1
PSF1
0
R/W
Prescaler Interrupt select 1
0
PSF0
0
R/W
Prescaler Interrupt select 0
5
Watchdog timer
If for any reason the CPU crashes, then the watchdog timer can detect this situation and output a system reset
signal. This function can be used to detect program overrun. For normal operation the watchdog timer must be
reset periodically by software at least once every three seconds (CLK = 32kHz) or a system reset signal is
generated to CPU and periphery. The watchdog is active during STANDBY. The watchdog reset function can be
deactivated by setting the NoWD bit to 1 in the Option register.
In worst case because of prescaler reset function WD time-out can come down to 2 seconds.
The watchdog timer is reset by writing 1 to the WDRST bit. Writing 0 to WDRST has no effect.
The watchdog timer also operates in STANDBY mode. It is therefore necessary to reset it if this mode continues
for more than three seconds. One method of doing this is to use the prescaler 1Hz interrupt such, that the
watchdog is reset every second.
Table 8.Watchdog register - WD
Bit
Name
Reset
R/W
Description
3
WDRST
-
R/W
Watchdog timer reset
2
Slmask
-
R/W
SLEEP mask bit
1
WD1
0
R
WD Timer data 1/4 Hz
0
WD0
0
R
WD Timer data 1/2 Hz
相關PDF資料 |
PDF描述 |
|---|---|
| EM6604SO24A | Microcontroller |
| EM6604SO24B | Microcontroller |
| EM6604TP24B | Microcontroller |
| EM6605DL24A | Microcontroller |
| EM6605SO24A | Microcontroller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EM6604SO24A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| EM6604SO24B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| EM6604TP24B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| EM6604WP11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Multi I/O Microcontroller |
| EM6604WP27 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Multi I/O Microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復。