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| 型號： | PIC16C505 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 14-Pin, 8-Bit CMOS Microcontroller(每個I/O口有25mA驅動/吸收電流,12個I/O口，帶WDT的微控制器) |
| 中文描述： | 14引腳，8位CMOS微控制器（每個的I / O口有25毫安驅動/吸收電流，12個的I / O口，帶看門狗的微控制器） |
| 文件頁數： | 36/80頁 |
| 文件大?。?/td> | 617K |
| 代理商： | PIC16C505 |
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PIC16C505
DS40192A-page 36
Preliminary
1998 Microchip Technology Inc.
7.7
Time-Out Sequence, Power Down,
and Wake-up from SLEEP Status Bits
(TO/PD/RBWUF)
The TO, PD, and RBWUF bits in the STATUS register
can be tested to determine if a RESET condition has
been caused by a power-up condition, a MCLR or
Watchdog Timer (WDT) reset, or a MCLR or WDT
reset.
These STATUS bits are only affected by events listed
in Table 7-8.
Table 7-4 lists the reset conditions for the special
function registers, while Table 7-3 lists the reset
conditions for all the registers.
TABLE 7-7:
TO/PD/RBWUF STATUS
AFTER RESET
RBWUF
TO
PD
RESET caused by
WDT wake-up from
SLEEP
WDT time-out (not from
SLEEP)
MCLR wake-up from
SLEEP
Power-up
MCLR not during SLEEP
Wake-up from SLEEP on
pin change
Legend: u = unchanged
Note 1:
The TO, PD, and RBWUF bits main-
tain their status (u) until a reset
occurs. A low-pulse on the MCLR
input does not change the TO, PD,
and RBWUF status bits.
0
0
0
0
0
1
0
1
0
0
0
1
1
u
1
1
u
0
Legend:
TABLE 7-8:
EVENTS AFFECTING TO/PD
STATUS BITS
Event
RBWUF
TO
PD
Remarks
Power-up
WDT Time-out
0
0
1
0
1
u
No effect
on PD
SLEEP instruction
CLRWDT
instruction
Wake-up from
SLEEP on pin
change
Legend: u = unchanged
A WDT time-out will occur regardless of the status of the
TO bit. A SLEEP instruction will be executed, regardless of
the status of the PD bit. Table 7-7 reflects the status of TO
and PD after the corresponding event.
u
u
1
1
0
1
1
1
0
7.8
Reset on Brown-Out
A brown-out is a condition where device power (V
DD
)
dips below its minimum value, but not to zero, and then
recovers. The device should be reset in the event of a
brown-out.
To reset PIC16C505 devices when a brown-out
occurs, external brown-out protection circuits may be
built, as shown in Figure 7-13 and Figure 7-14.
FIGURE 7-13: BROWN-OUT PROTECTION
CIRCUIT 1
FIGURE 7-14: BROWN-OUT PROTECTION
CIRCUIT 2
This circuit will activate reset when V
DD
goes below Vz +
0.7V (where Vz = Zener voltage).
*Refer to Figure 7-7 and Table 10-6 for internal weak pull-
up on MCLR.
33k
10k
40k*
V
DD
MCLR
PIC16C505
V
DD
Q1
This brown-out circuit is less expensive, although
less accurate. Transistor Q1 turns off when V
DD
is below a certain level such that:
R1
R1 + R2
*Refer to Figure 7-7 and Table 10-6 for internal weak
pull-up on MCLR.
V
DD
= 0.7V
R2
40k
V
DD
MCLR
PIC16C505
R1
Q1
V
DD
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PIC16C505/JW | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
| PIC16C505-04/P | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
| PIC16C505-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU (TUBE 30) 16C505 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C505 DIP14 |
| PIC16C505-04/SL | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
| PIC16C505-04/SL | 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C505 SOIC14 |
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