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| 型号： | PIC18F26J13-I/SP |
| 厂商： | Microchip Technology |
| 文件页数： | 31/71页 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU 64KB FLASH 28SPDIP |
| 产品培训模块： | 8-bit PIC® Microcontroller Portfolio |
| 标准包装： | 15 |
| 系列： | PIC® XLP™ 18F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 48MHz |
| 连通性： | I²C，LIN，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 22 |
| 程序存储器容量： | 64KB（32K x 16） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 3.8K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.15 V ~ 3.6 V |
| 数据转换器： | A/D 10x10b/12b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 配用： | MA180030-ND - BOARD DEMO PIC18F47J13 FS USB MA180029-ND - BOARD DEMO PIC18F47J53 FS USB |
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2010-2012 Microchip Technology Inc.
DS41412E-page 37
PIC18(L)F2X/4XK22
2.6.1.1
OSCTUNE Register
The HFINTOSC/MFINTOSC oscillator circuits are
factory calibrated but can be adjusted in software by
writing to the TUN<5:0> bits of the OSCTUNE register
(Register 2-3).
The default value of the TUN<5:0> is ‘000000’. The
value is a 6-bit two’s complement number.
When
the
OSCTUNE
register
is
modified,
the
HFINTOSC/MFINTOSC frequency will begin shifting to
the new frequency. Code execution continues during this
shift. There is no indication that the shift has occurred.
The TUN<5:0> bits in OSCTUNE do not affect the
LFINTOSC frequency. Operation of features that
depend on the LFINTOSC clock source frequency, such
as the Power-up Timer (PWRT), Watchdog Timer
(WDT),
Fail-Safe
Clock
Monitor
(FSCM)
and
peripherals, are not affected by the change in frequency.
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
31.25 kHz frequency option is selected. This is covered
in greater detail in Section 2.2.3 “Low Frequency
The PLLEN bit controls the operation of the frequency
multiplier, PLL, for all primary external clock sources
and internal oscillator modes. However, the PLL is
intended for operation with clock sources between
4 MHz and 16 MHz. For more details about the function
of the PLLEN bit, see Section 2.8.2 “PLL in HFIN-
2.7
Register Definitions: Oscillator Tuning
REGISTER 2-3:
OSCTUNE: OSCILLATOR TUNING REGISTER
R/W-0
INTSRC
PLLEN(1)
TUN<5:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
INTSRC: Internal Oscillator Low-Frequency Source Select bit
1
= 31.25 kHz device clock derived from the MFINTOSC or HFINTOSC source
0
= 31.25 kHz device clock derived directly from LFINTOSC internal oscillator
bit 6
PLLEN: Frequency Multiplier 4xPLL for HFINTOSC Enable bit(1)
1
= PLL enabled
0
= PLL disabled
bit 5-0
TUN<5:0>: Frequency Tuning bits – use to adjust MFINTOSC and HFINTOSC frequencies
011111
= Maximum frequency
011110
=
000001
=
000000
= Oscillator module (HFINTOSC and MFINTOSC) are running at the factory calibrated
frequency.
111111
=
100000
= Minimum frequency
Note 1:
The PLLEN bit is active for all the primary clock sources (internal or external) and is designed to operate
with clock frequencies between 4 MHz and 16 MHz.
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