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| 型號： | pic12ce674 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Pin, 8-Bit CMOS Microcontroller with A/D Converter(具A/D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲器的8位微控制器) |
| 中文描述： | 8引腳，8位CMOS微控制器與A / D轉(zhuǎn)換器（具的A / D轉(zhuǎn)換器和EEPROM的數(shù)據(jù)存儲器的8位微控制器） |
| 文件頁數(shù)： | 48/112頁 |
| 文件大小： | 1205K |
| 代理商： | PIC12CE674 |
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PIC12CE67X
DS40181A-page 48
Preliminary
1998 Microchip Technology Inc.
9.2.5
INTERNAL 4 MHz RC OSCILLATOR
The internal RC oscillator provides a fixed 4 MHz (nom-
inal) system clock at V
DD
= 5V and 25
°
C, see "Electrical
Specifications" section for information on variation over
voltage and temperature.
In addition, a calibration instruction is programmed into
the last address of the program memory which con-
tains the calibration value for the internal RC oscillator.
This value is programmed as a
RETLW XX
instruction
where XX is the calibration value. In order to retrieve
the calibration value, issue a
CALL YY
instruction where
YY is the last location in program memory (03FFh for
the PIC12CE673, 07FFh for the PIC12CE674). Control
will be returned to the user’s program with the calibra-
tion value loaded into the W register. The program
should then perform a MOVWF OSCCAL instruction to
load the value into the internal RC oscillator trim
register.
OSCCAL, when written to with the calibration value, will
“trim” the internal oscillator to remove process variation
from the oscillator frequency. Only bits <7:2> of OSC-
CAL are implemented, and bits <1:0> should be written
as 0 for compatibility with future devices. The oscillator
calibration location is not code protected.
9.2.6
CLKOUT
The PIC12CE67X can be configured to provide a clock
out signal CLKOUT on pin 3 when the configuration
word address (2007h) is programmed with FOSC2,
FOSC1, FOSC0 equal to 101 for INTRC or 111 for
EXTRC. The oscillator frequency, divided by 4 can be
used for test purposes or to synchronize other logic.
Note:
Please note that erasing the device will
also erase the pre-programmed internal
calibration value for the internal oscillator.
The calibration value must be saved prior
to erasing the part.
9.3
The PIC12CE67X differentiates between various kinds
of reset:
Power-on Reset (POR)
MCLR reset during normal operation
MCLR reset during SLEEP
WDT Reset (normal operation)
Some registers are not affected in any reset condition;
their status is unknown on POR and unchanged in any
other reset. Most other registers are reset to a “reset
state” on Power-on Reset (POR), on the MCLR and
WDT Reset, on MCLR reset during SLEEP. They are
not affected by a WDT Wake-up, which is viewed as the
resumption of normal operation. The TO and PD bits
are set or cleared differently in different reset situations
as indicated in Table 9-4. These bits are used in soft-
ware to determine the nature of the reset. See Table 9-
5 for a full description of reset states of all registers.
A simplified block diagram of the on-chip reset circuit is
shown in Figure 9-7.
The PIC12CE67X has a MCLR noise filter in the MCLR
reset path. The filter will detect and ignore small pulses.
It should be noted that a WDT Reset
does not drive
MCLR pin low.
Reset
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC12CE674/JW | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6 I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC12CE674-04/JM | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontroller with A/D Converter |
| PIC12CE674-04/JW | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory |
| PIC12CE674-04/P | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6 I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC12CE674-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 12CE674 DIP8 |
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