參數(shù)資料
型號(hào): PIC16F688-I/SL
廠商: Microchip Technology
文件頁(yè)數(shù): 123/204頁(yè)
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 4KX14 14SOIC
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 57
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,WDT
輸入/輸出數(shù): 12
程序存儲(chǔ)器容量: 7KB(4K x 14)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 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: 14-SOIC(0.154",3.90mm 寬)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 639 (CN2011-ZH PDF)
配用: XLT14SO-1-ND - SOCKET TRANSITION 14SOIC 150/208
AC162061-ND - HEADER INTRFC MPLAB ICD2 20PIN
AC162056-ND - HEADER INTERFACE ICD2 16F688
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2009 Microchip Technology Inc.
DS41203E-page 23
PIC16F688
3.3
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 internal oscillators: the 8 MHz High-
Frequency Internal Oscillator (HFINTOSC) and
the 31 kHz Low-Frequency Internal Oscillator
(LFINTOSC).
The system clock can be selected between external or
internal clock sources via the System Clock Select
(SCS) bit of the OSCCON register. See Section 3.6
“Clock Switching” for additional information.
3.4
External Clock Modes
3.4.1
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.
In order to minimize latency between external oscillator
start-up and code execution, the Two-Speed Clock
Start-up mode can be selected (see Section 3.7 “Two-
TABLE 3-1:
OSCILLATOR DELAY EXAMPLES
3.4.2
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
Switch From
Switch To
Frequency
Oscillator Delay
Sleep/POR
LFINTOSC
HFINTOSC
31 kHz
125 kHz to 8 MHz
Oscillator Warm-Up Delay (TWARM)
Sleep/POR
EC, RC
DC – 20 MHz
2 instruction cycles
LFINTOSC (31 kHz)
EC, RC
DC – 20 MHz
1 cycle of each
Sleep/POR
LP, XT, HS
32 kHz to 20 MHz
1024 Clock Cycles (OST)
LFINTOSC (31 kHz)
HFINTOSC
125 kHz to 8 MHz
1
μs (approx.)
OSC1/CLKIN
OSC2/CLKOUT(1)
I/O
Clock from
Ext. System
PIC MCU
Note
1:
Alternate pin functions are listed in
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F688IST 制造商:MICROCHIP 功能描述:New
PIC16F688T-E/SL 功能描述:8位微控制器 -MCU 7KB 256 RAM 12 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F688T-E/ST 功能描述:8位微控制器 -MCU 7KB 256 RAM 12 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F688T-E/ST VAO 制造商:Microchip Technology Inc 功能描述:
PIC16F688T-I/ML 功能描述:8位微控制器 -MCU 7KB 256 RAM 12I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT