參數(shù)資料
型號(hào): PIC16C72A-20I/ML
廠商: Microchip Technology
文件頁數(shù): 82/120頁
文件大?。?/td> 0K
描述: IC MCU OTP 2KX14 A/D PWM 28QFN
標(biāo)準(zhǔn)包裝: 61
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲(chǔ)器容量: 3.5KB(2K x 14)
程序存儲(chǔ)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(zhuǎn)換器: A/D 5x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-VQFN 裸露焊盤
包裝: 管件
其它名稱: PIC16C72A20I/ML
PIC16C62B/72A
DS35008B-page 64
Preliminary
1999 Microchip Technology Inc.
10.12
Watchdog Timer (WDT)
The Watchdog Timer is a free running on-chip RC oscil-
lator which does not require any external components.
This RC oscillator is separate from the RC oscillator of
the OSC1/CLKIN pin. The WDT will run, even if the
clock on the OSC1/CLKIN and OSC2/CLKOUT pins of
the device has been stopped, for example, by execution
of a SLEEP instruction.
During normal operation, a WDT time-out generates a
device RESET (Watchdog Timer Reset). If the device is
in SLEEP mode, a WDT time-out causes the device to
wake-up and continue with normal operation (Watch-
dog Timer Wake-up). The TO bit in the STATUS register
will be cleared upon a Watchdog Timer time-out.
The WDT can be permanently disabled by clearing
configuration bit WDTE (Section 10.1).
The WDT time-out period (TWDT, parameter #31) is
multiplied by the prescaler ratio, when the prescaler is
assigned to the WDT. The prescaler assignment
(assigned to either the WDT or Timer0) and prescaler
ratio are set in the OPTION_REG register.
.
FIGURE 10-8: WATCHDOG TIMER BLOCK DIAGRAM
FIGURE 10-9: SUMMARY OF WATCHDOG TIMER REGISTERS
Note:
The CLRWDT and SLEEP instructions clear
the WDT and the postscaler, if assigned to
the WDT, and prevent it from timing out and
generating a device RESET condition.
Note:
When a CLRWDT instruction is executed
and the prescaler is assigned to the WDT,
the prescaler count will be cleared, but the
prescaler assignment is not changed.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
2007h
Config. bits
BODEN
CP1
CP0
PWRTE
WDTE
FOSC1
FOSC0
81h
OPTION_REG
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
Legend: Shaded cells are not used by the Watchdog Timer.
From TMR0 Clock Source
To TMR0 (Figure 4-2)
Postscaler
WDT Timer
WDT
Enable Bit
0
1
M
U
X
PSA
8 - to - 1 MUX
PS2:PS0
0
1
MUX
PSA
WDT
Time-out
Note: PSA and PS2:PS0 are bits in the OPTION_REG register.
8
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