參數(shù)資料
型號： PIC16CR74
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 91/172頁
文件大?。?/td> 1506K
代理商： PIC16CR74
2007 Microchip Technology Inc.
DS21993C-page 89
PIC16CR7X
12.0
SPECIAL FEATURES OF THE
CPU
These devices have a host of features intended to max-
imize system reliability, minimize cost through elimina-
tion of external components, 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)
- Brown-out Reset (BOR)
Interrupts
Watchdog Timer (WDT)
Sleep
Code Protection
ID Locations
In-Circuit Serial Programming
These devices have a Watchdog Timer, which can be
enabled or disabled, using a Configuration bit. 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 oscil-
lator is stable. The other is the Power-up Timer
(PWRT), which provides a fixed delay of 72 ms (nomi-
nal) on power-up only. It is designed to keep the part in
Reset while the power supply stabilizes, and is enabled
or disabled, using a Configuration bit. 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 RC oscillator
option saves system cost while the LP crystal option
saves power. Configuration bits are used to select the
desired oscillator mode.
Additional information on special features is avail-
able in the “
PIC
Mid-Range MCU Family Reference
Manual
” (DS33023).
12.1
Configuration Bits
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 program memory location 2007h.
The user will note that address 2007h is beyond the
user program memory space, which can be accessed
only during programming.
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