Datasheet PIC16F631, PIC16F677, PIC16F685, PIC16F687, PIC16F689, PIC16F690 (Microchip) - 48
| 制造商 | Microchip |
| 描述 | 20-Pin Flash-Based, 8-Bit CMOS Microcontrollers |
| 页数 / 页 | 298 / 48 — PIC16F631/677/685/687/689/690. 3.4.3 LP, XT, HS MODES FIGURE 3-3: QUARTZ … |
| 文件格式/大小 | PDF / 3.1 Mb |
| 文件语言 | 英语 |
PIC16F631/677/685/687/689/690. 3.4.3 LP, XT, HS MODES FIGURE 3-3: QUARTZ CRYSTAL. OPERATION (LP, XT OR
该数据表的模型线
- PIC16F631-E/ML PIC16F631-E/P PIC16F631-E/SO PIC16F631-E/SS PIC16F631-I/ML PIC16F631-I/P PIC16F631-I/SO PIC16F631-I/SS PIC16F631T-E/SO PIC16F631T-E/SS PIC16F631T-I/ML PIC16F631T-I/SO PIC16F631T-I/SS PIC16F631T-I/SSVAO
- PIC16F677-E/ML PIC16F677-E/P PIC16F677-E/SO PIC16F677-E/SS PIC16F677-I/ML PIC16F677-I/P PIC16F677-I/SO PIC16F677-I/SS PIC16F677-I/SSVAO PIC16F677T-E/SO PIC16F677T-E/SS PIC16F677T-I/ML PIC16F677T-I/SO PIC16F677T-I/SS PIC16F677T-I/SSV05 PIC16F677T-I/SSVAO
- PIC16F685-E/ML PIC16F685-E/P PIC16F685-E/SO PIC16F685-E/SS PIC16F685-I/ML PIC16F685-I/P PIC16F685-I/SO PIC16F685-I/SS PIC16F685T-E/ML PIC16F685T-E/MLVAO PIC16F685T-E/SO PIC16F685T-E/SS PIC16F685T-E/SSVAO PIC16F685T-H/SSVAO PIC16F685T-I/ML PIC16F685T-I/SO PIC16F685T-I/SS PIC16F685T-I/SSVAO
- PIC16F687-E/ML PIC16F687-E/P PIC16F687-E/SO PIC16F687-E/SS PIC16F687-I/ML PIC16F687-I/P PIC16F687-I/SO PIC16F687-I/SS PIC16F687T-E/ML PIC16F687T-E/ML033 PIC16F687T-E/SS PIC16F687T-I/ML PIC16F687T-I/SO PIC16F687T-I/SS
- PIC16F689-E/ML PIC16F689-E/P PIC16F689-E/SO PIC16F689-E/SS PIC16F689-I/ML PIC16F689-I/P PIC16F689-I/SO PIC16F689-I/SS PIC16F689T-E/ML PIC16F689T-E/SO PIC16F689T-E/SS PIC16F689T-I/ML PIC16F689T-I/MLVAO PIC16F689T-I/SO PIC16F689T-I/SS
- PIC16F690-E/ML PIC16F690-E/P PIC16F690-E/SO PIC16F690-E/SS PIC16F690-H/MLVAO PIC16F690-H/SSVAO PIC16F690-I/ML PIC16F690-I/P PIC16F690-I/SO PIC16F690-I/SOVAO PIC16F690-I/SS PIC16F690-I/SSVAO PIC16F690-ICD/PT PIC16F690-ME/PL PIC16F690T-E/ML PIC16F690T-E/SO PIC16F690T-E/SS PIC16F690T-H/MLVAO PIC16F690T-H/SSVAO PIC16F690T-I/ML PIC16F690T-I/SO PIC16F690T-I/SS PIC16F690T-I/SSVAO
文件文字版本
PIC16F631/677/685/687/689/690
3.4.3 LP, XT, HS MODES FIGURE 3-3: QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE) The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
OSC1 and OSC2 (Figure 3-3). The mode selects a low,
medium or high gain setting of the internal inverteramplifier 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 3-3 and Figure 3-4 show typical circuits for
quartz crystal and ceramic resonators, respectively Note 1: Quartz crystal characteristics vary according to type, package and manufacturer. The
user should consult the manufacturer data
sheets for specifications and recommended
application.
2: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application. PIC® MCU
OSC1/CLKIN
C1 To Internal
Logic
Quartz
Crystal RF(2) OSC2/CLKOUT RS(1) C2 Sleep Note 1: A series resistor (RS) may be required for
quartz crystals with low drive level. 2: The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M. FIGURE 3-4: CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
PIC® MCU
OSC1/CLKIN C1 To Internal
Logic
RP(3) RF(2) Sleep 3: For oscillator design assistance, reference
the following Microchip Applications Notes:
• AN826, “Crystal Oscillator Basics and
Crystal Selection for rfPIC® and PIC®
Devices” (DS00826)
• AN849, “Basic PIC® Oscillator Design”
(DS00849)
• AN943, “Practical PIC® Oscillator
Analysis and Design” (DS00943)
• AN949, “Making Your Oscillator Work”
(DS00949) DS40001262F-page 48 C2 Ceramic
RS(1)
Resonator Note 1: OSC2/CLKOUT A series resistor (RS) may be required for
ceramic resonators with low drive level. 2: The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M.
3: An additional parallel feedback resistor (RP)
may be required for proper ceramic resonator
operation. 2005-2015 Microchip Technology Inc.
3.4.3 LP, XT, HS MODES FIGURE 3-3: QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE) The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
OSC1 and OSC2 (Figure 3-3). The mode selects a low,
medium or high gain setting of the internal inverteramplifier 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 3-3 and Figure 3-4 show typical circuits for
quartz crystal and ceramic resonators, respectively Note 1: Quartz crystal characteristics vary according to type, package and manufacturer. The
user should consult the manufacturer data
sheets for specifications and recommended
application.
2: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application. PIC® MCU
OSC1/CLKIN
C1 To Internal
Logic
Quartz
Crystal RF(2) OSC2/CLKOUT RS(1) C2 Sleep Note 1: A series resistor (RS) may be required for
quartz crystals with low drive level. 2: The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M. FIGURE 3-4: CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
PIC® MCU
OSC1/CLKIN C1 To Internal
Logic
RP(3) RF(2) Sleep 3: For oscillator design assistance, reference
the following Microchip Applications Notes:
• AN826, “Crystal Oscillator Basics and
Crystal Selection for rfPIC® and PIC®
Devices” (DS00826)
• AN849, “Basic PIC® Oscillator Design”
(DS00849)
• AN943, “Practical PIC® Oscillator
Analysis and Design” (DS00943)
• AN949, “Making Your Oscillator Work”
(DS00949) DS40001262F-page 48 C2 Ceramic
RS(1)
Resonator Note 1: OSC2/CLKOUT A series resistor (RS) may be required for
ceramic resonators with low drive level. 2: The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M.
3: An additional parallel feedback resistor (RP)
may be required for proper ceramic resonator
operation. 2005-2015 Microchip Technology Inc.