參數(shù)資料
型號： PIC16C505-20/P
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDIP14
封裝： 0.300 INCH, PLASTIC, DIP-14
文件頁數(shù)： 30/85頁
文件大小： 1205K
代理商： PIC16C505-20/P
PIC16C505
DS40192C-page 36
1999 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.
7.8
Reset on Brown-Out
A brown-out is a condition where device power (VDD)
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 7-12 and Figure 7-13.
FIGURE 7-12: BROWN-OUT PROTECTION
CIRCUIT 1
TABLE 7-7:
TO/PD/RBWUF STATUS
AFTER RESET
RBWUF
TO
PD
RESET caused by
00
0
WDT wake-up from
SLEEP
00
u
WDT time-out (not from
SLEEP)
01
0
MCLR wake-up from
SLEEP
01
1
Power-up
0u
u
MCLR not during SLEEP
11
0
Wake-up from SLEEP on
pin change
Legend: u = unchanged
Note 1:
The TO, PD, and RBWUF bits maintain their
status (u) until a reset occurs. A low-pulse on the
MCLR input does not change the TO, PD, and
RBWUF status bits.
This circuit will activate reset when VDD goes below
Vz + 0.7V (where Vz = Zener voltage).
Note 1: Pin must be confirmed as MCLR.
33k
10k
40k*
VDD
MCLR(1)
PIC16C505
VDD
Q1
FIGURE 7-13: BROWN-OUT PROTECTION
CIRCUIT 2
FIGURE 7-14: BROWN-OUT PROTECTION
CIRCUIT 3
This brown-out circuit is less expensive, although
less accurate. Transistor Q1 turns off when VDD
is below a certain level such that:
Note 1: Pin must be confirmed as MCLR.
VDD
R1
R1 + R2
= 0.7V
R2
40k*
VDD
MCLR(1)
PIC16C505
R1
Q1
VDD
This brown-out protection circuit employs Microchip
Technology’s
MCP809
microcontroller
supervisor.
There
are
7
different
trip
point
selections
to
accommodate 5V to 3V systems.
MCLR
PIC12C5XX
VDD
VSS
RST
MCP809
VDD
bypass
capacitor
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16C505T-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(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
PIC16C505T-04E/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz Ext Temp SOIC14 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
PIC16C505T-04I/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz Ind Temp SOIC14 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
PIC16C505T-20/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 20MHz SOIC14 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
PIC16C505T-20E/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 20MHz ExtTemp SOIC14 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
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