- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358629 > 35007B (Microchip Technology Inc.) 18-pin Enhanced FLASH/EEPROM 8-bit Microcontroller PDF資料下載
參數(shù)資料
| 型號： | 35007B |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 18-pin Enhanced FLASH/EEPROM 8-bit Microcontroller |
| 中文描述： | 18針/ EEPROM的8位微控制器的閃存 |
| 文件頁數(shù)： | 28/88頁 |
| 文件大?。?/td> | 1495K |
| 代理商： | 35007B |
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頁當(dāng)前第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頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁
PIC16F84A
DS35007B-page 26
2001 Microchip Technology Inc.
6.4
Power-on Reset (POR)
A Power-on Reset pulse is generated on-chip when
V
DD
rise is detected (in the range of 1.2V - 1.7V). To
take advantage of the POR, just tie the MCLR pin
directly (or through a resistor) to V
DD
. This will
eliminate external RC components usually needed to
create Power-on Reset. A minimum rise time for V
DD
must be met for this to operate properly. See Electrical
Specifications for details.
When the device starts normal operation (exits the
RESET condition), device operating parameters (volt-
age, frequency, temperature, etc.) must be met to
ensure operation. If these conditions are not met, the
device must be held in RESET until the operating con-
ditions are met.
For additional information, refer to Application Note
AN607, "Power-up Trouble Shooting"
The POR circuit does not produce an internal RESET
when V
DD
declines.
6.5
Power-up Timer (PWRT)
The Power-up Timer (PWRT) provides a fixed 72 ms
nominal time-out (T
PWRT
) from POR (Figures 6-6
through 6-9). The Power-up Timer operates on an
internal RC oscillator. The chip is kept in RESET as
long as the PWRT is active. The PWRT delay allows
the V
DD
to rise to an acceptable level (possible excep-
tion shown in Figure 6-9).
A configuration bit, PWRTE, can enable/disable the
PWRT. See Register 6-1 for the operation of the
PWRTE bit for a particular device.
The power-up time delay T
PWRT
will vary from chip to
chip due to V
DD
, temperature, and process variation.
See DC parameters for details.
6.6
Oscillator Start-up Timer (OST)
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle delay (from OSC1 input) after the
PWRT delay ends (Figure 6-6, Figure 6-7, Figure 6-8
and Figure 6-9). This ensures the crystal oscillator or
resonator has started and stabilized.
The OST time-out (T
OST
) is invoked only for XT, LP and
HS modes and only on Power-on Reset or wake-up
from SLEEP.
When V
DD
rises very slowly, it is possible that the
T
PWRT
time-out and T
OST
time-out will expire before
V
DD
has reached its final value. In this case
(Figure 6-9), an external Power-on Reset circuit may
be necessary (Figure 6-5).
FIGURE 6-5:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW V
DD
POWER-UP)
Note
1:
External Power-on Reset circuit is required
only if V
DD
power-up rate is too slow. The
diode D helps discharge the capacitor
quickly when V
DD
powers down.
2:
R < 40 k
is recommended to make sure
that voltage drop across R does not exceed
0.2V (max leakage current spec on MCLR
pin is 5
μ
A). A larger voltage drop will
degrade V
IH
level on the MCLR pin.
3:
R1 = 100
to 1 k
will limit any current flow-
ing into MCLR from external capacitor C, in
the event of a MCLR pin breakdown due to
ESD or EOS.
C
R1
R
D
V
DD
MCLR
PIC16FXX
V
DD
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 350PJT | 1200A ITGQ Gate Turn-Off Hockey Puk SCRs |
| 351-90-116-00-017 | PCB connectors 2.54 mm Single row / double row Solder tail |
| 351-90-116-00-016 | HOOD DB50 PLASTIC 10 PACK |
| 351-90-116-00-005 | DB-50 PLASTIC HOOD |
| 351-90-116-00-004 | CRIMP SHELLS DB50 FEMALE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 35-007-BU | 制造商:GC Electronics 功能描述:Switch Toggle ON OFF (ON) SPDT Bat Toggle Solder 5A 250VAC 28VDC Panel Mount with Threads Bulk |
| 35008 | 功能描述:WRENCH OPEN END METRIC 10X11MM RoHS:否 類別:工具 >> 鉗子、扳手 系列:350 標(biāo)準(zhǔn)包裝:1 系列:- 尖端 - 類型:針頭，直形 工具類型:鉗子 特點(diǎn):人機(jī)工程型手柄，ESD 安全，鋸齒狀 長度:5.75"（146.05mm） 重量:0.23 磅（104.33g） |
| 35-008 | 制造商:GC Electronics 功能描述:SPDT(ON)-OFF-(ON)MIN BAT TO 制造商:Ideal Industries Inc 功能描述:TENITE HANDLES 8 IN 制造商:GC Electronics 功能描述:Switch Toggle (ON) OFF (ON) SPDT Bat Toggle Solder 5A 250VAC 28VDC Panel Mount with Threads 制造商:Ideal Industries Inc 功能描述:Switch Toggle (ON) OFF (ON) SPDT Bat Toggle |
| 35008 BK199 | 制造商:Alpha Wire Company 功能描述:35008 BLACK 1000 = 1000 FT |
| 350080-1 | 功能描述:端子 RING 18-14 10 .025TP RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。