參數(shù)資料
型號(hào)： PIC18LF2450T-I/SO
廠商： Microchip Technology
文件頁數(shù)： 75/143頁
文件大?。?/td> 0K
描述： IC PIC MCU FLASH 8KX16 28SOIC
標(biāo)準(zhǔn)包裝： 1,600
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 48MHz
連通性： UART/USART，USB
外圍設(shè)備： 欠壓檢測/復(fù)位，HLVD，POR，PWM，WDT
輸入/輸出數(shù)： 23
程序存儲(chǔ)器容量： 16KB（8K x 16）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 768 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 10x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
包裝： 帶卷 (TR)
PIC18F2450/4450
2006 Microchip Technology Inc.
Advance Information
DS39760A-page 35
FIGURE 3-2:
TRANSITION TIMING FROM SEC_RUN MODE TO PRI_RUN MODE (HSPLL)
3.2.3
RC_RUN MODE
In RC_RUN mode, the CPU and peripherals are
clocked from the internal oscillator; the primary clock is
shut down. When using the INTRC source, this mode
provides the best power conservation of all the Run
modes while still executing code. It works well for user
applications which are not highly timing sensitive or do
not require high-speed clocks at all times.
If the primary clock source is the internal oscillator
(INTRC), there are no distinguishable differences
between the PRI_RUN and RC_RUN modes during
execution. However, a clock switch delay will occur dur-
ing entry to and exit from RC_RUN mode. Therefore, if
the primary clock source is the internal oscillator, the
use of RC_RUN mode is not recommended.
This mode is entered by setting SCS1 to ‘1’. Although
it is ignored, it is recommended that SCS0 also be
cleared; this is to maintain software compatibility with
future devices. When the clock source is switched to
the INTRC (see Figure 3-3), the primary oscillator is
shut down and the OSTS bit is cleared.
On transitions from RC_RUN mode to PRI_RUN mode,
the device continues to be clocked from the INTRC
while the primary clock is started. When the primary
clock becomes ready, a clock switch to the primary
clock occurs (see Figure 3-4). When the clock switch is
complete, the OSTS bit is set and the primary clock is
providing the device clock. The IDLEN and SCS bits
are not affected by the switch. The INTRC source will
continue to run if either the WDT or the Fail-Safe Clock
Monitor is enabled.
Q1
Q3 Q4
OSC1
Peripheral
Program
PC
T1OSI
PLL Clock
Q1
PC + 4
Q2
Output
Q3
Q4
Q1
CPU Clock
PC + 2
Clock
Counter
Q2
Q3
Note
1:
TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
2:
Clock transition typically occurs within 2-4 TOSC.
SCS1:SCS0 bits Changed
TPLL(1)
12
n-1
n
Clock(2)
OSTS bit Set
Transition
TOST(1)
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PIC18LF2455-I/SP 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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
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PIC18LF2458-I/SO 功能描述:8位微控制器 -MCU 24KB Flash 2KB RAM 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
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