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| 型號： | PIC18LF27J53-I/ML |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 28/71頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PIC MCU 128KB FLASH 28QFN |
| 產(chǎn)品培訓(xùn)模塊： | 8-bit PIC® Microcontroller Portfolio |
| 標(biāo)準(zhǔn)包裝： | 61 |
| 系列： | PIC® XLP™ 18F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 48MHz |
| 連通性： | I²C，LIN，SPI，UART/USART，USB |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 22 |
| 程序存儲器容量： | 128KB（64K x 16） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 3.8K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 2.75 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 10x10b/12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 28-VQFN 裸露焊盤 |
| 包裝： | 管件 |
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PIC18(L)F2X/4XK22
DS41412E-page 34
2010-2012 Microchip Technology Inc.
2.4
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: Clock modules
(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 block. The Oscillator block
has three internal oscillators: the 16 MHz High-
Frequency Internal Oscillator (HFINTOSC),
500 kHz Medium-Frequency Internal Oscillator
(MFINTOSC) and the 31.25 kHz Low-Frequency
Internal Oscillator (LFINTOSC).
The system clock can be selected between external or
internal clock sources via the System Clock Select
(SCS<1:0>) bits of the OSCCON register. See
for
additional
information.
2.5
External Clock Modes
2.5.1
OSCILLATOR START-UP TIMER (OST)
When 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 2-2.
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 2.12
TABLE 2-2:
OSCILLATOR DELAY EXAMPLES
2.5.2
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 2-5 shows the pin
connections for EC mode.
The External Clock (EC) offers different power modes,
Low Power (ECLP), Medium Power (ECMP) and High
Power (ECHP), selectable by the FOSC<3:0> bits.
Each mode is best suited for a certain range of
frequencies. The ranges are:
ECLP – below 500 kHz
ECMP – between 500 kHz and 16 MHz
ECHP – above 16 MHz
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 2-5:
EXTERNAL CLOCK (EC)
MODE OPERATION
Switch From
Switch To
Frequency
Oscillator Delay
Sleep/POR
LFINTOSC
MFINTOSC
HFINTOSC
31.25 kHz
31.25 kHz to 500 kHz
31.25 kHz to 16 MHz
Oscillator Warm-Up Delay (TWARM)
Sleep/POR
EC, RC
DC – 64 MHz
2 instruction cycles
LFINTOSC (31.25 kHz)
EC, RC
DC – 64 MHz
1 cycle of each
Sleep/POR
LP, XT, HS
32 kHz to 40 MHz
1024 Clock Cycles (OST)
Sleep/POR
4xPLL
32 MHz to 64 MHz
1024 Clock Cycles (OST) + 2 ms
LFINTOSC (31.25 kHz)
LFINTOSC
HFINTOSC
31.25 kHz to 16 MHz
1
s (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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| PIC18LF27J53T-I/ML | 功能描述:8位微控制器 -MCU USB 128KB Flash 4KB RAM 12 MIPS 12b ADC 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC18LF27J53T-I/SO | 功能描述:8位微控制器 -MCU USB 128KB Flash 4KB RAM 12 MIPS 12b ADC 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC18LF27J53T-I/SS | 功能描述:8位微控制器 -MCU USB 128KB Flash 4KB RAM 12 MIPS 12b ADC 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC18LF320-I/S0 | 制造商:Microchip Technology Inc 功能描述: |
| PIC18LF4220-I/ML | 功能描述:8位微控制器 -MCU 4KB 512 RAM 36I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
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