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參數(shù)資料
| 型號： | 12C508A |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Hookup/Lead Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:White; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes |
| 中文描述： | 8引腳，8位CMOS微控制器 |
| 文件頁數(shù)： | 42/113頁 |
| 文件大小： | 1604K |
| 代理商： | 12C508A |
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PIC12C5XX
DS40139E-page 42
1999 Microchip Technology Inc.
FIGURE 8-11: TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO V
DD
): SLOW V
DD
RISE TIME
V
DD
MCLR
INTERNAL POR
DRT TIME-OUT
INTERNAL RESET
T
DRT
V1
When V
rises slowly, the T
time-out expires long before V
DD
has reached its final value. In
this example, the chip will reset properly if, and only if, V1
≥
V
DD
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 V
DD
to rise above V
DD
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 (V
IH
MCLR)
level. Thus, programming GP3/MCLR/V
PP
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/V
PP
pin as a general purpose input.
The Device Reset time delay will vary from chip to chip
due to V
DD
, 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
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.
disabled
by
TABLE 8-5:
DRT (DEVICE RESET TIMER
PERIOD)
Oscillator
Configuration
POR Reset
Subsequent
Resets
IntRC &
ExtRC
XT & LP
18 ms (typical)
300 μs (typical)
18 ms (typical)
18 ms (typical)
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| 12C671 | Test Prod Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:White; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1 RoHS Compliant: Yes |
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| 12CE673 | HookUp/Lead Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes |
| 12CGQ150 | SCHOTTKY RECTIFIER |
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