參數(shù)資料
型號(hào)： PIC16C56A-20I/JW
元件分類： 微控制器/微處理器
英文描述： 8-BIT, UVPROM, 20 MHz, RISC MICROCONTROLLER, CDIP18
封裝： 0.300 INCH, WINDOWED, CERDIP-18
文件頁數(shù)： 95/158頁
文件大?。?/td> 1194K
代理商： PIC16C56A-20I/JW
2000 Microchip Technology Inc.
Preliminary
DS30453C-page 41
PIC16C5X
7.7
Time-Out Sequence and Power-down
Status Bits (TO/PD)
The TO and PD 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 Wake-up
Reset.
These STATUS bits are only affected by events listed
in Table 7-7.
Table 7-3 lists the RESET conditions for the Special
Function Registers, while Table 7-4 lists the RESET
conditions for all the registers.
TABLE 7-6:
TO/PD STATUS AFTER
RESET
TO
PD
RESET was caused by
11
Power-up (POR)
uu
MCLR Reset (normal operation)(1)
10
MCLR Wake-up Reset (from SLEEP)
01
WDT Reset (normal operation)
00
WDT Wake-up Reset (from SLEEP)
Legend: u = unchanged
Note 1: The TO and PD bits maintain their status
(u) until a RESET occurs. A low-pulse on
the MCLR input does not change the TO
and PD status bits.
TABLE 7-7:
EVENTS AFFECTING TO/PD
STATUS BITS
Event
TO
PD
Remarks
Power-up
11
WDT Time-out
0u
No effect on PD
SLEEP
instruction
10
CLRWDT
instruction
11
Legend: u = unchanged
Note:
A WDT time-out will occur regardless of
the status of the TO bit. A SLEEP instruc-
tion will be executed, regardless of the sta-
tus of the PD bit.
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 PIC16C5X devices when a brown-out occurs,
external brown-out protection circuits may be built, as
shown in Figure 7-14 and Figure 7-15.
FIGURE 7-14: BROWN-OUT PROTECTION
CIRCUIT 1
FIGURE 7-15: BROWN-OUT PROTECTION
CIRCUIT 2
This circuit will activate RESET when VDD goes
below Vz + 0.7V (where Vz = Zener voltage).
33k
10k
40k
VDD
MCLR
PIC16C5X
VDD
Q1
This brown-out circuit is less expensive, although
less accurate. Transistor Q1 turns off when VDD is
below a certain level such that:
VDD
R1
R1 + R2
= 0.7V
R2
40k
VDD
MCLR
PIC16C5X
R1
Q1
VDD
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PIC16C56A20SO 制造商:MICROCHIP 功能描述:New
PIC16C56A-40/P 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 40MHz PDIP18 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
PIC16C56A-40/SO 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 40MHz SOIC18 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
PIC16C56A-40/SS 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 40MHz SSOP20 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
PIC16C56AT-04/SO 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 4 MHz SOIC18 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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