参数资料
型号: PIC18LF2450T-I/SO
厂商: Microchip Technology
文件页数: 77/143页
文件大小: 0K
描述: IC PIC MCU FLASH 8KX16 28SOIC
标准包装: 1,600
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 48MHz
连通性: UART/USART,USB
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 23
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 10x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 带卷 (TR)
PIC18F2450/4450
2006 Microchip Technology Inc.
Advance Information
DS39760A-page 37
3.3
Sleep Mode
The power-managed Sleep mode in the PIC18F2450/
4450 devices is identical to the legacy Sleep mode
offered in all other PICmicro devices. It is entered by
clearing the IDLEN bit (the default state on device
Reset) and executing the SLEEP instruction. This shuts
down the selected oscillator (Figure 3-5). All clock
source status bits are cleared.
Entering the Sleep mode from any other mode does not
require a clock switch. This is because no clocks are
needed once the controller has entered Sleep. If the
WDT is selected, the INTRC source will continue to
operate. If the Timer1 oscillator is enabled, it will also
continue to run.
When a wake event occurs in Sleep mode (by interrupt,
Reset or WDT time-out), the device will not be clocked
until the clock source selected by the SCS1:SCS0 bits
becomes ready (see Figure 3-6), or it will be clocked
from the internal oscillator if either the Two-Speed
Start-up or the Fail-Safe Clock Monitor are enabled
either case, the OSTS bit is set when the primary clock
is providing the device clocks. The IDLEN and SCS bits
are not affected by the wake-up.
3.4
Idle Modes
The Idle modes allow the controller’s CPU to be
selectively shut down while the peripherals continue to
operate. Selecting a particular Idle mode allows users
to further manage power consumption.
If the IDLEN bit is set to ‘1’ when a SLEEP instruction is
executed, the peripherals will be clocked from the clock
source selected using the SCS1:SCS0 bits; however, the
CPU will not be clocked. The clock source status bits are
not affected. Setting IDLEN and executing a SLEEP
instruction provides a quick method of switching from a
given Run mode to its corresponding Idle mode.
If the WDT is selected, the INTRC source will continue
to operate. If the Timer1 oscillator is enabled, it will also
continue to run.
Since the CPU is not executing instructions, the only
exits from any of the Idle modes are by interrupt, WDT
time-out or a Reset. When a wake event occurs, CPU
execution
is
delayed
by
an
interval
of
TCSD
(parameter 38, Table 21-10) while it becomes ready to
execute code. When the CPU begins executing code,
it resumes with the same clock source for the current
Idle mode. For example, when waking from RC_IDLE
mode, the internal oscillator will clock the CPU and
peripherals (in other words, RC_RUN mode). The
IDLEN and SCS bits are not affected by the wake-up.
While in any Idle mode or Sleep mode, a WDT time-out
will result in a WDT wake-up to the Run mode currently
specified by the SCS1:SCS0 bits.
FIGURE 3-5:
TRANSITION TIMING FOR ENTRY TO SLEEP MODE
FIGURE 3-6:
TRANSITION TIMING FOR WAKE FROM SLEEP (HSPLL)
Q4
Q3
Q2
OSC1
Peripheral
Sleep
Program
Q1
Counter
Clock
CPU
Clock
PC + 2
PC
Q3 Q4 Q1 Q2
OSC1
Peripheral
Program
PC
PLL Clock
Q3 Q4
Output
CPU Clock
Q1
Q2 Q3 Q4 Q1 Q2
Clock
Counter
PC + 6
PC + 4
Q1 Q2 Q3 Q4
Wake Event
Note 1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
TOST(1)
TPLL(1)
OSTS bit Set
PC + 2
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