參數(shù)資料
型號: PIC16LF721-I/P
廠商: Microchip Technology
文件頁數(shù): 56/135頁
文件大?。?/td> 0K
描述: MCU PIC 4K FLASH 20-DIP
產(chǎn)品培訓(xùn)模塊: 8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 22
系列: PIC® XLP™ 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 16MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 17
程序存儲器容量: 7KB(4K x 14)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-DIP(0.300",7.62mm)
包裝: 管件
2010-2011 Microchip Technology Inc.
Preliminary
DS41430C-page 27
PIC16(L)F720/721
3.0
RESETS
The PIC16(L)F720/721 differentiates between various
kinds of Reset:
a)
Power-on Reset (POR)
b)
WDT Reset during normal operation
c)
WDT Reset during Sleep
d)
MCLR Reset during normal operation
e)
MCLR Reset during Sleep
f)
Brown-out Reset (BOR)
Some registers are not affected in any Reset condition;
their status is unknown on POR and unchanged in any
other Reset. Most other registers are reset to a “Reset
state” on:
Power-on Reset (POR)
MCLR Reset
MCLR Reset during Sleep
WDT Reset
Brown-out Reset (BOR)
Most registers are not affected by a WDT wake-up
since this is viewed as the resumption of normal
operation. TO and PD bits are set or cleared differently
in different Reset situations, as indicated in Table 3-5.
These bits are used in software to determine the nature
of the Reset.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 3-1.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Section 23.0 “Electrical
Specifications” for pulse width specifications.
FIGURE 3-1:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
MCLR/VPP
VDD
WDT
Module
POR
WDTOSC
WDT
Time-out
Power-on Reset
PWRT
Chip_Reset
11-bit Ripple Counter
Reset
Enable PWRT
Sleep
Brown-out(1)
Reset
BOREN
CLKIN
Note 1:
Refer to the Configuration Word Register 1 (Register 8-1).
MCLRE
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