參數(shù)資料
型號(hào)： 12CE673
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:Black; 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微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲(chǔ)器
文件頁數(shù)： 45/116頁
文件大?。?/td> 671K
代理商： 12CE673
1998 Microchip Technology Inc.
Preliminary
DS40181B-page 45
PIC12CE67X
9.0
SPECIAL FEATURES OF THE
CPU
What sets a microcontroller apart from other proces-
sors are special circuits to deal with the needs of real-
time applications. The PIC12CE67X family has a host
of such features intended to maximize system reliabil-
ity, minimize cost through elimination of external com-
ponents, provide power saving operating modes and
offer code protection. These are:
Oscillator selection
Reset
- Power-on Reset (POR)
- Power-up Timer (PWRT)
- Oscillator Start-up Timer (OST)
Interrupts
Watchdog Timer (WDT)
SLEEP
Code protection
ID locations
In-circuit serial programming
The PIC12CE67X has a Watchdog Timer which can be
shut off only through configuration bits. It runs off its
own RC oscillator for added reliability. There are two
timers that offer necessary delays on power-up. One is
the Oscillator Start-up Timer (OST), intended to keep
the chip in reset until the crystal oscillator is stable. The
other is the Power-up Timer (PWRT), which provides a
fixed delay of 72 ms (nominal) on power-up only,
designed to keep the part in reset while the power sup-
ply stabilizes. With these two timers on-chip, most
applications need no external reset circuitry.
SLEEP mode is designed to offer a very low current
power-down mode. The user can wake-up from SLEEP
through external reset, Watchdog Timer Wake-up, or
through an interrupt. Several oscillator options are also
made available to allow the part to fit the application.
The EXTRC oscillator option saves system cost while
the LP crystal option saves power. A set of configura-
tion bits are used to select various options.
9.1
The configuration bits can be programmed (read as '0')
or left unprogrammed (read as '1') to select various
device configurations. These bits are mapped in pro-
gram memory location 2007h.
The user will note that address 2007h is beyond the
user program memory space. In fact, it belongs to the
special test/configuration memory space (2000h-
3FFFh), which can be accessed only during
programming.
Configuration Bits
FIGURE 9-1:
CONFIGURATION WORD
CP1
CP0
CP1
CP0
CP1
CP0
MCLRE
CP1
CP0
PWRTE WDTE FOSC2 FOSC1 FOSC0
Register:
Address
CONFIG
2007h
bit13
bit 13-8,
CP1:CP0:
Code Protection bit pairs
(1)
6-5:
11
= Code protection off
10
= Locations 400h through 7FEh code protected (do not use for PIC12CE673)
01
= Locations 200h through 7FEh code protected
00
= All memory is code protected
bit0
bit 7:
MCLRE:
Master Clear Reset Enable bit
1 = Master Clear Enabled
0 = Master Clear Disabled
bit 4:
PWRTE:
Power-up Timer Enable bit
1 = PWRT disabled
0 = PWRT enabled
bit 3:
WDTE:
Watchdog Timer Enable bit
1 = WDT enabled
0 = WDT disabled
bit 2-0:
FOSC2:FOSC0:
Oscillator Selection bits
111
= EXTRC, Clockout on OSC2
110
= EXTRC, OSC2 is I/O
101
= INTRC, Clockout on OSC2
100
= INTRC, OSC2 is I/O
011
= Invalid Selection
010
= HS Oscillator
001
= XT Oscillator
000
= LP Oscillator
Note 1:
All of the CP1:CP0 pairs have to be given the same value to enable the code protection scheme listed.
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