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| 型号： | MA300012 |
| 厂商： | Microchip Technology |
| 文件页数： | 22/92页 |
| 文件大小： | 0K |
| 描述： | MODULE DSPIC30F SAMPLE 64QFP |
| 标准包装： | 1 |
| 模块/板类型： | dsPIC30F 插件模块 |
| 适用于相关产品： | DM240001 |
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dsPIC30F
FIGURE 7-1:
OSCILLATOR SYSTEM BLOCK DIAGRAM
OSC1
OSC2
Primary
Oscillator
PLL
x4, x8, x16
PLL
Primary Osc
Internal Fast
RC (FRC)
Oscillator
Clock
SOSCO
Secondary
Secondary Osc
Switching
and
Control
Block
F OSC
Programmable 4 x F CY
Clock
Divider
Oscillator
SOSCI
32 kHz
Internal Low
Power RC
(LPRC) Osc
To Timer1
7.4
Programmable Power-up Timer
7.5
Oscillator Start-up Timer/Stabilizer
(PWRT)
There are two internal timers that offer necessary
delays on power-up. One is the Power-up Timer
(PWRT), which provides a delay on power-up only. The
PWRT keeps the part in Reset while the power supply
stabilizes. The other is the Oscillator Start-up Timer
(OST), intended to keep the chip in Reset until the
crystal oscillator is stable. With these two timers on-
chip, most applications need no external Reset
circuitry.
DS70043F-page 20
(OST)
An Oscillator Start-up Timer (OST) is included to
ensure that a crystal oscillator (or ceramic resonator)
has started and stabilized. The OST is a simple 10-bit
counter that counts 1024 TOSC cycles before
releasing the oscillator clock to the rest of the system.
The time-out period is designated as TOST. The TOST
time is involved every time the oscillator has to restart
(i.e., on Power-On Reset (POR), Brown-Out Reset
(BOR) and wake-up from Sleep). The oscillator start-up
timer is applied to the LP oscillator, XT, XTL and HS
modes (upon wake-up from Sleep, POR and BOR) for
the primary oscillator.
? 2005 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MA300013 | 功能描述:子卡和OEM板 dsPIC30F 80L Plug In Sample RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA300013 | 制造商:Microchip Technology Inc 功能描述:Tools Development kit Kit Con |
| MA300014 | 功能描述:子卡和OEM板 dsPIC30F 80L Plug In Sample (6014A) RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA300015 | 功能描述:子卡和OEM板 dsPIC30F 80L Plug In Sample (6010A). RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA300016 | 功能描述:子卡和OEM板 dsPICDEM 80-PIN PIM RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
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