參數(shù)資料
型號(hào): PIC18F2220-I/SP
廠商: Microchip Technology
文件頁(yè)數(shù): 199/266頁(yè)
文件大小: 0K
描述: IC MCU FLASH 2KX16 A/D 28DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 15
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 40MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,LVD,POR,PWM,WDT
輸入/輸出數(shù): 25
程序存儲(chǔ)器容量: 4KB(2K x 16)
程序存儲(chǔ)器類(lèi)型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 4.2 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-DIP(0.300",7.62mm)
包裝: 管件
配用: DVA18XP280-ND - DEVICE ADAPTER 18F2220 PDIP 28LD
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PIC18F2220/2320/4220/4320
DS39599G-page 36
2007 Microchip Technology Inc.
3.4
Run Modes
If the IDLEN bit is clear when a SLEEP instruction is
executed, the CPU and peripherals are both clocked
from the source selected using the SCS1:SCS0 bits.
While these operating modes may not afford the power
conservation of Idle or Sleep modes, they do allow the
device to continue executing instructions by using a
lower frequency clock source. RC_RUN mode also
offers the possibility of executing code at a frequency
greater than the primary clock.
Wake-up from a power-managed Run mode can be
triggered by an interrupt, or any Reset, to return to full-
power operation. As the CPU is executing code in Run
modes, several additional exits from Run modes are
possible. They include exit to Sleep mode, exit to a cor-
responding Idle mode, and exit by executing a RESET
instruction. While the device is in any of the power-
managed Run modes, a WDT time-out will result in a
WDT Reset.
3.4.1
PRI_RUN MODE
The PRI_RUN mode is the normal full-power execution
mode. If the SLEEP instruction is never executed, the
microcontroller operates in this mode (a SLEEP instruc-
tion is executed to enter all other power-managed
modes). All other power-managed modes exit to
PRI_RUN mode when an interrupt or WDT time-out
occur.
There is no entry to PRI_RUN mode. The OSTS bit is
set. The IOFS bit may be set if the internal oscillator
block is the primary clock source (see Section 2.7.1
3.4.2
SEC_RUN MODE
The SEC_RUN mode is the compatible mode to the
“clock switching” feature offered in other PIC18
devices. In this mode, the CPU and peripherals are
clocked from the Timer1 oscillator. This gives users the
option of lower power consumption while still using a
high-accuracy clock source.
SEC_RUN mode is entered by clearing the IDLEN bit,
setting SCS1:SCS0 = 01 and executing a SLEEP
instruction. The system clock source is switched to the
Timer1 oscillator (see Figure 3-9), the primary oscilla-
tor is shut down, the T1RUN bit (T1CON<6>) is set and
the OSTS bit is cleared.
When a wake-up event occurs, the peripherals and
CPU continue to be clocked from the Timer1 oscillator
while the primary clock is started. When the primary
clock becomes ready, a clock switch back to the primary
clock occurs (see Figure 3-6). When the clock switch is
complete, the T1RUN bit is cleared, the OSTS bit is set
and the primary clock is providing the system clock. The
IDLEN and SCS bits are not affected by the wake-up;
the Timer1 oscillator continues to run.
Firmware can force an exit from SEC_RUN mode. By
clearing the T1OSCEN bit (T1CON<3>), an exit from
SEC_RUN back to normal full-power operation is trig-
gered. The Timer1 oscillator will continue to run and
provide the system clock even though the T1OSCEN bit
is cleared. The primary clock is started. When the
primary clock becomes ready, a clock switch back to the
primary clock occurs (see Figure 3-6). When the clock
switch is complete, the Timer1 oscillator is disabled, the
T1RUN bit is cleared, the OSTS bit is set and the
primary clock is providing the system clock. The IDLEN
and SCS bits are not affected by the wake-up.
FIGURE 3-9:
TIMING TRANSITION FOR ENTRY TO SEC_RUN MODE
Note:
The Timer1 oscillator should already be
running prior to entering SEC_RUN mode.
If the T1OSCEN bit is not set when try-
ing to set the SCS0 bit, the write to
SCS0 will not occur. If the Timer1 oscilla-
tor is enabled, but not yet running, system
clocks will be delayed until the oscillator
has started; in such situations, initial oscil-
lator operation is far from stable and
unpredictable operation may result.
Q4
Q3
Q2
OSC1
Peripheral
Program
Q1
T1OSI
Q1
Counter
Clock
CPU
Clock
PC + 2
PC
1234
567
8
Clock Transition
Q4
Q3
Q2
Q1
Q3
Q2
PC + 2
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