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| 型號(hào)： | PIC18F8310 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 64/80-Pin Flash Microcontrollers with nanoWatt Technology |
| 中文描述： | 64/80-Pin閃存微控制器與納瓦技術(shù) |
| 文件頁(yè)數(shù)： | 34/404頁(yè) |
| 文件大?。?/td> | 3268K |
| 代理商： | PIC18F8310 |
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PIC18F6310/6410/8310/8410
DS39635A-page 32
Preliminary
2004 Microchip Technology Inc.
2.6
Internal Oscillator Block
The PIC18F6310/6410/8310/8410 devices include an
internal oscillator block, which generates two different
clock signals; either can be used as the microcontrol-
ler’s clock source. This may eliminate the need for
external oscillator circuits on the OSC1 and/or OSC2
pins.
The main output (INTOSC) is an 8 MHz clock source,
which can be used to directly drive the device clock. It
also drives a postscaler, which can provide a range of
clock frequencies from 31 kHz to 4 MHz. The INTOSC
output is enabled when a clock frequency from 125 kHz
to 8 MHz is selected.
The other clock source is the internal RC oscillator
(INTRC), which provides a nominal 31 kHz output.
INTRC is enabled if it is selected as the device clock
source; it is also enabled automatically when any of the
following are enabled:
Power-up Timer
Fail-Safe Clock Monitor
Watchdog Timer
Two-Speed Start-up
These features are discussed in greater detail in
Section 23.0 “Special Features of the CPU”
.
The clock source frequency (INTOSC direct, INTRC
direct or INTOSC postscaler) is selected by configuring
the IRCF bits of the OSCCON register (Register 2-2).
2.6.1
INTIO MODES
Using the internal oscillator as the clock source elimi-
nates the need for up to two external oscillator pins,
which can then be used for digital I/O. Two distinct
configurations are available:
In INTIO1 mode, the OSC2 pin outputs F
OSC
/4,
while OSC1 functions as RA7 for digital input and
output.
In INTIO2 mode, OSC1 functions as RA7 and
OSC2 functions as RA6, both for digital input and
output.
2.6.2
INTOSC OUTPUT FREQUENCY
The internal oscillator block is calibrated at the factory
to produce an INTOSC output frequency of 8.0 MHz.
The INTRC oscillator operates independently of the
INTOSC source. Any changes in INTOSC across
voltage and temperature are not necessarily reflected
by changes in INTRC and vice versa.
2.6.3
The internal oscillator’s output has been calibrated at
the factory, but can be adjusted in the user’s applica-
tion. This is done by writing to the OSCTUNE register
(Register 2-1). The tuning sensitivity is constant
throughout the tuning range.
OSCTUNE REGISTER
When the OSCTUNE register is modified, the INTOSC
and INTRC frequencies will begin shifting to the new
frequency. The INTRC clock will reach the new
frequency within 8 clock cycles (approximately
8 * 32
μ
s = 256
μ
s). The INTOSC clock will stabilize
within 1 ms. Code execution continues during this shift.
There is no indication that the shift has occurred.
The OSCTUNE register also implements the INTSRC
and PLLEN bits, which control certain features of the
internal oscillator block. The INTSRC bit allows users
to select which internal oscillator provides the clock
source when the 31 kHz frequency option is selected.
This is covered in greater detail in
Section 2.7.1
“Oscillator Control Register”
.
The PLLEN bit controls the operation of the frequency
multiplier, PLL, in internal oscillator modes.
2.6.4
PLL IN INTOSC MODES
The 4x frequency multiplier can be used with the
internal oscillator block to produce faster device clock
speeds than are normally possible with an internal
oscillator. When enabled, the PLL produces a clock
speed of up to 32 MHz.
Unlike HSPLL mode, the PLL is controlled through
software. The control bit, PLLEN (OSCTUNE<6>), is
used to enable or disable its operation.
The PLL is available when the device is configured to use
the internal oscillator block as its primary clock source
(FOSC3:FOSC0 =
1001
or
1000
). Additionally, the PLL
will only function when the selected output frequency is
either 4 MHz or 8 MHz (OSCCON<6:4> =
111
or
110
). If
both of these conditions are not met, the PLL is disabled.
The PLLEN control bit is only functional in those inter-
nal oscillator modes where the PLL is available. In all
other modes, it is forced to ‘
0
’ and is effectively
unavailable.
2.6.5
INTOSC FREQUENCY DRIFT
The factory calibrates the internal oscillator block out-
put (INTOSC) for 8 MHz. However, this frequency may
drift as V
DD
or temperature changes, which can affect
the controller operation in a variety of ways. It is possi-
ble to adjust the INTOSC frequency by modifying the
value in the OSTUNE register. This has no effect on the
INTRC clock source frequency.
Tuning the INTOSC source requires knowing when to
make the adjustment, in which direction it should be
made and in some cases, how large a change is
needed. Three examples follow, but other techniques
may be used.
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| PIC18F8310-E/PT | 功能描述:8位微控制器 -MCU 8kBF 768RM 70I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC18F8310-I/PT | 功能描述:8位微控制器 -MCU 8kBF 768RM 70I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC18F8310T-I/PT | 功能描述:8位微控制器 -MCU 8kBF 768RM 70I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC18F8390-E/PT | 功能描述:8位微控制器 -MCU 8kBF 768RM 66I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC18F8390-I/PT | 功能描述:8位微控制器 -MCU 8kBF 768RM 66I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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