參數(shù)資料
型號： PIC16F874
廠商： Microchip Technology Inc.
英文描述： Enhanced FLASH/EEPROM 8-Bit Microcontroller With A/D Module(驅(qū)動/吸收電流高，工作電壓2.5~5.5V，微控制器)
中文描述： 增強(qiáng)的閃存/ EEPROM 8位A / D模塊（驅(qū)動/吸收電流高，工作電壓2.5?5.5V的微控制器，微控制器）
文件頁數(shù)： 106/170頁
文件大小： 4191K
代理商： PIC16F874
PIC16F62X
DS40300C-page 104
Preliminary
2003 Microchip Technology Inc.
FIGURE 14-16:
WATCHDOG TIMER BLOCK DIAGRAM
TABLE 14-10: SUMMARY OF WATCHDOG TIMER REGISTERS
14.9
Power-Down Mode (SLEEP)
The Power-down mode is entered by executing a
SLEEP
instruction.
If enabled, the Watchdog Timer will be cleared but
keeps running, the PD bit in the STATUS register is
cleared, the TO bit is set, and the oscillator driver is
turned off. The I/O ports maintain the status they had,
before
SLEEP
was executed (driving high, low, or hi-
impedance).
For lowest current consumption in this mode, all I/O
pins should be either at V
DD
, or V
SS
, with no external
circuitry drawing current from the I/O pin and the com-
parators, and V
REF
should be disabled. I/O pins that
are hi-impedance inputs should be pulled high or low
externally to avoid switching currents caused by float-
ing inputs. The T0CKI input should also be at V
DD
or
V
SS
for lowest current consumption. The contribution
from on-chip pull-ups on PORTB should be considered.
The MCLR pin must be at a logic high level (V
IHMC
).
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR Reset
Value on all
other
RESETS
2007h
Config.
bits
LVP
BODEN
MCLRE
FOSC2
PWRTE
WDTE
FOSC1
FOSC0
uuuu uuuu
uuuu uuuu
81h
OPTION
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
1111 1111
Legend:
Note
_
= Unimplemented location, read as “0”, + = Reserved for future use
Shaded cells are not used by the Watchdog Timer.
1:
(Figure 6-1)
Note
1:
T0SE, T0CS, PSA, PS0-PS2 are bits in the OPTION register.
From TMR0 Clock Source
Watchdog
Timer
WDT
Enable Bit
0
1
8
8 to 1 MUX
PS<2:0>
To TMR0
(Figure 6-1)
0
1
PSA
WDT
Timeout
PSA
M
U
X
MUX
3
WDT POSTSCALER/
TMR0 PRESCALER
Note:
It should be noted that a RESET generated
by a WDT timeout does not drive MCLR
pin low.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F874-04/L 功能描述:8位微控制器 -MCU 7KB 192 RAM 33 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
PIC16F874-04/L 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F874 PLCC44
PIC16F87404/P 制造商:Microchip Technology Inc 功能描述:MICROCONTROLLER IC
PIC16F874-04/P 功能描述:8位微控制器 -MCU 7KB 192 RAM 33 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
PIC16F874-04/PQ 功能描述:8位微控制器 -MCU 7KB 192 RAM 33 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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