參數(shù)資料
型號: PIC16C712-04/P
廠商: Microchip Technology
文件頁數(shù): 62/106頁
文件大?。?/td> 0K
描述: IC MCU OTP 1KX14 A/D PWM 18DIP
產(chǎn)品培訓模塊: Asynchronous Stimulus
標準包裝: 25
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲器容量: 1.75KB(1K x 14)
程序存儲器類型: OTP
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 4x8b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 18-DIP(0.300",7.62mm)
包裝: 管件
2005 Microchip Technology Inc.
DS41106B-page 57
PIC16C712/716
FIGURE 9-8:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 9-9:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
FIGURE 9-10:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 3
9.8
Time-out Sequence
On power-up the time-out sequence is as follows: First
PWRT time-out is invoked after the POR time delay has
expired. Then OST is activated. The total time-out will
vary based on oscillator configuration and the status of
the PWRT. For example, in RC mode with the PWRT
disabled, there will be no time-out at all. Figure 9-11,
and
depict
time-out
sequences on power-up.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, the time-outs will expire. Then
bringing MCLR high will begin execution immediately
(Figure 9-13). This is useful for testing purposes or to
synchronize more than one PIC16CXXX device
operating in parallel.
Table 9-5 shows the Reset conditions for some Special
Function Registers, while Table 9-6 shows the Reset
conditions for all the registers.
Note 1: This circuit will activate Reset when
VDD goes below (Vz + 0.7V) where
Vz = Zener voltage.
2: Internal Brown-out Reset circuitry
should be disabled when using this
circuit.
VDD
33k
10k
40k
VDD
MCLR
PIC16C7XX
Q1
Note 1: This brown-out circuit is less expensive,
albeit less accurate. Transistor Q1 turns
off when VDD is below a certain level
such that:
2: Internal Brown-out Reset should be
disabled when using this circuit.
3: Resistors should be adjusted for the
characteristics of the transistor.
VDD x
R1
R1 + R2
= 0.7V
VDD
R2
40k
VDD
MCLR
PIC16C7XX
R1
Q1
This
brown-out
protection
circuit
employs
Microchip Technology’s MCP809 microcontroller
supervisor. The MCP8XX and MCP1XX families
of supervisors provide push-pull and open
collector outputs with both high and low active
Reset pins. There are 7 different trip point
selections to accommodate 5V and 3V systems
MCLR
PIC16C7XX
VDD
VDD
Vss
RST
MCP809
VDD
bypass
capacitor
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