參數(shù)資料
型號(hào)： PIC16F628A
廠商： Microchip Technology Inc.
英文描述： 18-pin Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology(18引腳，基于FLASH的8位CMOS微控制器，使用毫微瓦特技術(shù))
中文描述： 18引腳基于閃存的8位CMOS微控制器與納瓦技術(shù)（18引腳，基于閃存的8位的CMOS微控制器，使用毫微瓦特技術(shù)）
文件頁數(shù)： 99/168頁
文件大?。?/td> 2756K
代理商： PIC16F628A
2004 Microchip Technology Inc.
Preliminary
DS40044B-page 97
PIC16F627A/628A/648A
14.2.8
SPECIAL FEATURE: DUAL SPEED
OSCILLATOR MODES
A software programmable dual speed Oscillator mode
is provided when the PIC16F627A/628A/648A is
configured in the INTOSC Oscillator mode. This feature
allows users to dynamically toggle the oscillator speed
between 4 MHz and 37 kHz nominal in the INTOSC
mode. Applications that require low current power
savings, but cannot tolerate putting the part into Sleep,
may use this mode.
There is a time delay associated with the transition
between Fast and Slow oscillator speeds. This
Oscillator Speed Transition delay consists of two
existing clock pulses and eight new speed clock
pulses. During this Clock Speed Transition Delay the
System Clock is halted causing the processor to be
frozen in time. During this delay the Program Counter
and the Clock Out stop.
The OSCF bit in the PCON register is used to control Dual
Speed mode. See
Section 4.2.2.6 "PCON Register"
,
Register 4-6.
14.3
Reset
The PIC16F627A/628A/648A differentiates between
various kinds of Reset:
a)
Power-on Reset (POR)
b)
MCLR Reset during normal operation
c)
MCLR Reset during Sleep
d)
WDT Reset (normal operation)
e)
WDT wake-up (Sleep)
f)
Brown-out Reset (BOR)
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, Brown-out Reset, MCLR
Reset, WDT Reset and MCLR Reset during Sleep.
They are not affected by a WDT wake-up, since this is
viewed as the resumption of normal operation. TO and
PD bits are set or cleared differently in different Reset
situations as indicated in Table 14-4. These bits are
used in software to determine the nature of the Reset.
See Table 14-7 for a full description of Reset states of
all registers.
A simplified block diagram of the on-chip Reset circuit
is shown in Figure 14-6.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Table 17-7 for pulse width
specification.
FIGURE 14-6:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
External
Reset
S
R
Q
MCLR/
V
PP
Pin
V
DD
OSC1/
CLKIN
Pin
WDT
Module
V
DD
rise
detect
OST/PWRT
WDT
Time out
Reset
Power-on Reset
OST
PWRT
Chip_Reset
10-bit Ripple-counter
Enable OST
Enable PWRT
Sleep
See Table 14-3 for time out situations.
Note
1:
This is a separate oscillator from the INTOSC/RC oscillator.
Brown-out
detect Reset
BOREN
10-bit Ripple-counter
Q
Schmitt Trigger Input
On-chip
(1)
OSC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F628A-E/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(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
PIC16F628A-E/P 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(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
PIC16F628A-E/SO 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(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
PIC16F628A-E/SS 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(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
PIC16F628A-I/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(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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