參數(shù)資料
型號(hào)： P12C508
廠商： Microchip Technology Inc.
英文描述： 8-Pin, 8-Bit CMOS Microcontroller
中文描述： 8引腳，8位CMOS微控制器
文件頁數(shù)： 25/84頁
文件大?。?/td> 526K
代理商： P12C508
1996 Microchip Technology Inc.
Advance Information
DS40139A-page 25
PIC12C5XX
7.0
SPECIAL FEATURES OF THE
CPU
What sets a microcontroller apart from other
processors are special circuits to deal with the needs
of real-time applications. The PIC12C5XX family of
microcontrollers has a host of such features intended
to maximize system reliability, minimize cost through
elimination of external components, provide power
saving operating modes and offer code protection.
These features are:
Oscillator selection
Reset
- Power-On Reset (POR)
- Device Reset Timer (DRT)
- Wake-up from SLEEP on pin change
Watchdog Timer (WDT)
SLEEP
Code protection
ID locations
In-circuit Serial Programming
The PIC12C5XX has a Watchdog Timer which can be
shut off only through configuration bit WDTE. It runs
off of its own RC oscillator for added reliability. If using
XT or LP selectable oscillator options, there is always
an 18 ms delay provided by the Device Reset Timer
(DRT), intended to keep the chip in reset until the
crystal oscillator is stable. If using INTRC or EXTRC
there is an 18 ms delay only on V
DD
power-up. With
this timer on-chip, most applications need no external
reset circuitry.
The SLEEP mode is designed to offer a very low
current power-down mode. The user can wake-up
from SLEEP through a change on input pins or
through a Watchdog Timer time-out. Several oscillator
options are also made available to allow the part to fit
the application, including an internal 4 MHz oscillator.
The EXTRL RC oscillator option saves system cost
while the LP crystal option saves power. A set of
configuration bits are used to select various options.
7.1
Configuration Bits
The PIC12C5XX configuration word consists of 5 bits.
Configuration bits can be programmed to select
various device configurations. Two bits are for the
selection of the oscillator type, one bit is the Watchdog
Timer enable bit, and one bit is the MCLR enable bit.
One bit is the code protection bit (Figure 7-1).
OTP devices have the oscillator configuration
programmed at the factory and these parts are tested
accordingly (see “Product Identification System” on
the inside back cover).
FIGURE 7-1:
CONFIGURATION WORD FOR PIC12C508 OR PIC12C509
—
—
10
Unimplemented
—
9
—
8
—
7
—
6
—
5
MCLRE
4
CP
3
WDTE FOSC1 FOSC0
2
1
Register:
Address
(1)
:
CONFIG
FFFh
bit11
bit 11-5:
bit0
bit 4:
MCLRE:
MCLR enable bit.
1 = MCLR enabled
0 = MCLR disabled
bit 3:
CP:
Code protection bit.
1 = Code protection off
0 = Code protection on
bit 2:
WDTE:
Watchdog timer enable bit
1 = WDT enabled
0 = WDT disabled
bit 1-0:
FOSC1:FOSC0:
Oscillator selection bits
11 = EXTRC - external RC oscillator
10 = INTRC - internal RC oscillator
01 = XT oscillator
00 = LP oscillator
Note 1:
Refer to the PIC12C5XX Programming Specifications to determine how to access the
configuration word. This register is not user addressable during device operation.
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