参数资料
型号: PIC18LF4221-I/ML
厂商: Microchip Technology
文件页数: 48/110页
文件大小: 0K
描述: IC PIC MCU FLASH 2KX16 44QFN
产品培训模块: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装: 45
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 36
程序存储器容量: 4KB(2K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 13x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-VQFN 裸露焊盘
包装: 管件
产品目录页面: 642 (CN2011-ZH PDF)
PIC18F2221/2321/4221/4321 FAMILY
DS39689F-page 42
2009 Microchip Technology Inc.
If the IRCF bits and the INTSRC bit are all clear, the
INTOSC output is not enabled and the IOFS bit will
remain clear; there will be no indication of the current
clock source. The INTRC source is providing the
device clocks.
If the IRCF bits are changed from all clear (thus,
enabling the INTOSC output) or if INTSRC is set, the
IOFS bit becomes set after the INTOSC output
becomes stable. Clocks to the device continue while
the INTOSC source stabilizes after an interval of
TIOBST (parameter 39, Table 27-10).
If the IRCF bits were previously at a non-zero value, or
if INTSRC was set before setting SCS1 and the
INTOSC source was already stable, the IOFS bit will
remain set.
On transitions from RC_RUN mode to PRI_RUN mode,
the device continues to be clocked from the INTOSC
multiplexer while the primary clock is started. When the
primary clock becomes ready, a clock switch to the
primary clock occurs (see Figure 4-4). When the clock
switch is complete, the IOFS bit is cleared, 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.
FIGURE 4-3:
TRANSITION TIMING TO RC_RUN MODE
FIGURE 4-4:
TRANSITION TIMING FROM RC_RUN MODE TO PRI_RUN MODE
Q4
Q3
Q2
OSC1
Peripheral
Program
Q1
INTRC
Q1
Counter
Clock
CPU
Clock
PC + 2
PC
123
n-1
n
Clock Transition(1)
Q4
Q3
Q2
Q1
Q3
Q2
PC + 4
Note 1: Clock transition typically occurs within 2-4 TOSC.
Q1
Q3 Q4
OSC1
Peripheral
Program
PC
INTOSC
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.
SCS<1:0> bits Changed
TPLL(1)
12
n-1 n
Clock
OSTS bit Set
Transition(2)
Multiplexer
TOST(1)
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