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| 型號： | PIC16HV616T-I/ML |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 21/44頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PIC MCU FLASH 2KX14 16QFN |
| 產(chǎn)品培訓(xùn)模塊： | Asynchronous Stimulus |
| 標(biāo)準(zhǔn)包裝： | 3,300 |
| 系列： | PIC® 16F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，WDT |
| 輸入/輸出數(shù)： | 11 |
| 程序存儲器容量： | 3.5KB（2K x 14） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 16-VQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
| 配用： | AC162083-ND - HEADER MPLAB ICD2 PIC16F616 8/14 AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN XLT16QFN1-ND - SOCKET TRANSITION 14DIP TO 16QFN |
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PIC16F610/616/16HV610/616
DS41288F-page 28
2009 Microchip Technology Inc.
3.2
Clock Source Modes
Clock Source modes can be classified as external or
internal.
External Clock modes rely on external circuitry for
the clock source. Examples are: Oscillator mod-
ules (EC mode), quartz crystal resonators or
ceramic resonators (LP, XT and HS modes) and
Resistor-Capacitor (RC) mode circuits.
Internal clock sources are contained internally
within the Oscillator module. The Oscillator
module has two selectable clock frequencies:
4 MHz and 8 MHz
The system clock can be selected between external or
internal clock sources via the FOSC<2:0> bits of the
Configuration Word register.
3.3
External Clock Modes
3.3.1
EC MODE
The External Clock (EC) mode allows an externally
generated logic level as the system clock source. When
operating in this mode, an external clock source is
connected to the OSC1 input and the OSC2 is available
for general purpose I/O. Figure 3-2 shows the pin
connections for EC mode.
The Oscillator Start-up Timer (OST) is disabled when
EC mode is selected. Therefore, there is no delay in
operation after a Power-on Reset (POR) or wake-up
from Sleep. Because the PIC MCU design is fully
static, stopping the external clock input will have the
effect of halting the device while leaving all data intact.
Upon restarting the external clock, the device will
resume operation as if no time had elapsed.
FIGURE 3-2:
EXTERNAL CLOCK (EC)
MODE OPERATION
3.3.2
OSCILLATOR START-UP TIMER
(OST)
If the Oscillator module is configured for LP, XT or HS
modes, the Oscillator Start-up Timer (OST) counts
1024 oscillations from OSC1. This occurs following a
Power-on Reset (POR) and when the Power-up Timer
(PWRT) has expired (if configured), or a wake-up from
Sleep. During this time, the program counter does not
increment and program execution is suspended. The
OST ensures that the oscillator circuit, using a quartz
crystal resonator or ceramic resonator, has started and
is providing a stable system clock to the Oscillator
module. When switching between clock sources, a
delay is required to allow the new clock to stabilize.
These oscillator delays are shown in Table 3-1.
TABLE 3-1:
OSCILLATOR DELAY EXAMPLES
OSC1/CLKIN
OSC2/CLKOUT(1)
I/O
Clock from
Ext. System
PIC MCU
Note
1:
Alternate pin functions are listed in the
Switch From
Switch To
Frequency
Oscillator Delay
Sleep/POR
INTOSC
4 MHz to 8 MHz
Oscillator Warm-Up Delay (TWARM)
Sleep/POR
EC, RC
DC – 20 MHz
2 Instruction Cycles
Sleep/POR
LP, XT, HS
32 kHz to 20 MHz
1024 Clock Cycles (OST)
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