參數(shù)資料
型號： PIC16LF1527-I/MR
廠商： Microchip Technology
文件頁數(shù)： 87/94頁
文件大?。?/td> 0K
描述： MCU PIC 28KB FLASH 64QFN
產(chǎn)品培訓模塊： Configurable Logic Cell
8-bit PIC® Microcontroller Portfolio
標準包裝： 40
系列： PIC® XLP™ 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
連通性： I²C，LIN，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 54
程序存儲器容量： 28KB（16K x 14）
程序存儲器類型： 閃存
RAM 容量： 1.5K x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 30x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-VFQFN 裸露焊盤
包裝： 管件
2011 Microchip Technology Inc.
Preliminary
DS41458B-page 53
PIC16(L)F1526/27
5.2
Clock Source Types
Clock sources can be classified as external or internal.
External clock sources rely on external circuitry for the
clock source to function. Examples are: oscillator mod-
ules (EC mode), quartz crystal resonators or ceramic
resonators (LP, XT and HS modes) and Resis-
tor-Capacitor (RC) mode circuits.
Internal clock sources are contained internally within the
oscillator module. The internal oscillator block has two
internal oscillators that are used to generate the internal
system clock sources: the 16 MHz High-Frequency
Internal Oscillator and the 31 kHz Low-Frequency
Internal Oscillator (LFINTOSC).
The system clock can be selected between external or
internal clock sources via the System Clock Select
(SCS) bits in the OSCCON register. See Section 5.3
for additional information.
5.2.1
EXTERNAL CLOCK SOURCES
An external clock source can be used as the device
system clock by performing one of the following
actions:
Program the FOSC<2:0> bits in the Configuration
Word 1 to select an external clock source that will
be used as the default system clock upon a
device Reset.
Write the SCS<1:0> bits in the OSCCON register
to switch the system clock source to:
- Secondary oscillator during run-time, or
- An external clock source determined by the
value of the FOSC bits.
tion.
5.2.1.1
EC Mode
The External Clock (EC) mode allows an externally
generated logic level signal to be the system clock
source. When operating in this mode, an external clock
source
is
connected
to
the
OSC1
input.
OSC2/CLKOUT is available for general purpose I/O or
CLKOUT. Figure 5-2 shows the pin connections for EC
mode.
EC mode has three power modes to select from through
Configuration Word 1:
High power, 4-20 MHz (FOSC = 111)
Medium power, 0.5-4 MHz (FOSC = 110)
Low power, 0-0.5 MHz (FOSC = 101)
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 5-2:
EXTERNAL CLOCK (EC)
MODE OPERATION
5.2.1.2
LP, XT, HS Modes
The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
OSC1 and OSC2 (Figure 5-3). The three modes select
a low, medium or high gain setting of the internal
inverter-amplifier to support various resonator types
and speed.
LP
Oscillator mode selects the lowest gain setting of the
internal inverter-amplifier. LP mode current consumption
is the least of the three modes. This mode is designed to
drive only 32.768 kHz tuning-fork type crystals (watch
crystals).
XT
Oscillator mode selects the intermediate gain
setting of the internal inverter-amplifier. XT mode
current consumption is the medium of the three modes.
This mode is best suited to drive resonators with a
medium drive level specification.
HS
Oscillator mode selects the highest gain setting of the
internal inverter-amplifier. HS mode current consumption
is the highest of the three modes. This mode is best
suited for resonators that require a high drive setting.
Figure 5-3 and Figure 5-4 show typical circuits for
quartz crystal and ceramic resonators, respectively.
OSC1/CLKIN
OSC2/CLKOUT
Clock from
Ext. System
PIC MCU
FOSC/4 or I/O(1)
Note
1:
Output depends upon CLKOUTEN bit of the
Configuration Word 1.
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