FIGURE 8-11: TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO V
參數(shù)資料
型號： PIC12C508AT-04I/MF
廠商： Microchip Technology
文件頁數(shù)： 51/113頁
文件大?。?/td> 0K
描述： IC MCU OTP 512X12 8-DFN
標準包裝： 3,300
系列： PIC® 12C
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
外圍設備： POR，WDT
輸入/輸出數(shù)： 5
程序存儲器容量： 768B（512 x 12）
程序存儲器類型： OTP
RAM 容量： 25 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-VDFN 裸露焊盤
包裝： 帶卷 (TR)
配用： AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN
AC164032-ND - ADAPTER PICSTART PLUS 8DFN/DIP
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
其它名稱： PIC12C508AT04I/MF
PIC12C5XX
DS40139E-page 42
1999 Microchip Technology Inc.
FIGURE 8-11: TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO VDD): SLOW VDD RISE TIME
VDD
MCLR
INTERNAL POR
DRT TIME-OUT
INTERNAL RESET
TDRT
V1
When VDD rises slowly, the TDRT time-out expires long before VDD has reached its final value. In
this example, the chip will reset properly if, and only if, V1
≥ VDD min.
8.5
Device Reset Timer (DRT)
In the PIC12C5XX, DRT runs from RESET and varies
based on oscillator selection (see Table 8-5.)
The DRT operates on an internal RC oscillator. The
processor is kept in RESET as long as the DRT is
active. The DRT delay allows VDD to rise above VDD
min., and for the oscillator to stabilize.
Oscillator circuits based on crystals or ceramic
resonators require a certain time after power-up to
establish a stable oscillation. The on-chip DRT keeps
the device in a RESET condition for approximately 18
ms after MCLR has reached a logic high (VIHMCLR)
level. Thus, programming GP3/MCLR/VPP as MCLR
and using an external RC network connected to the
MCLR input is not required in most cases, allowing for
savings in cost-sensitive and/or space restricted
applications, as well as allowing the use of the GP3/
MCLR/VPP pin as a general purpose input.
The Device Reset time delay will vary from chip to chip
due to VDD, temperature, and process variation. See
AC parameters for details.
The DRT will also be triggered upon a Watchdog
Timer time-out. This is particularly important for
applications using the WDT to wake from SLEEP
mode automatically.
8.6
Watchdog Timer (WDT)
The Watchdog Timer (WDT) is a free running on-chip
RC oscillator which does not require any external
components. This RC oscillator is separate from the
external RC oscillator of the GP5/OSC1/CLKIN pin
and the internal 4 MHz oscillator. That means that the
WDT will run even if the main processor clock has
been stopped, for example, by execution of a SLEEP
instruction. During normal operation or SLEEP, a WDT
reset or wake-up reset generates a device RESET.
The TO bit (STATUS<4>) will be cleared upon a
Watchdog Timer reset.
The
WDT
can
be
permanently
disabled
by
programming the configuration bit WDTE as a ’0’
(Section 8.1). Refer to the PIC12C5XX Programming
Specifications to determine how to access the
configuration word.
TABLE 8-5:
DRT (DEVICE RESET TIMER
PERIOD)
Oscillator
Configuration
POR Reset
Subsequent
Resets
IntRC &
ExtRC
18 ms (typical)
300 s (typical)
XT & LP
18 ms (typical)
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