參數(shù)資料
型號： 25C128
廠商： Microchip Technology Inc.
英文描述： 128K 5.0V SPI Bus Serial EEPROM(4.5~5.5V,128K位,SPI總線串行EEPROM)
中文描述： 128K的5.0V SPI總線串行EEPROM（4.5?5.5V的，128K的位和SPI總線串行EEPROM的）
文件頁數(shù)： 106/170頁
文件大小： 4191K
代理商： 25C128
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.
相關(guān)PDF資料
PDF描述
25LC128 128K 5.0V SPI Bus Serial EEPROM(2.5~5.5V,128K位,SPI總線串行EEPROM)
25C256 256K 5.0V SPI Bus Serial EEPROM(4.5~5.5V,256K位,SPI總線串行EEPROM)
25C160 8K/16K 5.0V SPI Bus Serial EEPROM
25C080 8K 5.0V SPI Bus Serial EEPROM(4.5~5.5V,3MHz,8K位,10M次可自定時擦寫周期,EEPROM)
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