參數(shù)資料
型號(hào)： AT91SAM9XE512-QU
廠商： Atmel
文件頁(yè)數(shù)： 104/159頁(yè)
文件大?。?/td> 0K
描述： MCU ARM9 512K FLASH 208-PQFP
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)包裝： 24
系列： SAM9XE
核心處理器： ARM9
芯體尺寸： 16/32-位
速度： 180MHz
連通性： EBI/EMI，以太網(wǎng)，I²C，MMC，SPI，SSC，UART/USART，USB
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 96
程序存儲(chǔ)器容量： 512KB（512K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 56K x 8
電壓 - 電源 (Vcc/Vdd)： 1.65 V ~ 1.95 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 208-MQFP，208-PQFP
包裝： 托盤(pán)
配用： AT91SAM9XE-EK-ND - KIT EVAL FOR AT91SAM9XE
AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9
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2007 Microchip Technology Inc.
DS41213D-page 37
PIC16F5X
8.0
SPECIAL FEATURES OF THE
CPU
What sets a microcontroller apart from other proces-
sors are special circuits that deal with the needs of real-
time applications. The PIC16F5X family of microcon-
trollers have 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
Device Reset Timer
Watchdog Timer (WDT)
Sleep
Code protection
User ID locations
In-Circuit Serial Programming (ICSP)
The PIC16F5X family 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. There is
an 18 ms delay provided by the Device Reset Timer
(DRT), intended to keep the chip in Reset until the
crystal oscillator is stable. 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 external Reset or through a Watchdog Timer
time-out. 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. A set of Configuration bits are
used to select various options.
8.1
Configuration 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; one bit is for code protection for the
PIC16F5X devices (Register 8-1).
REGISTER 8-1:
CONFIGURATION WORD FOR PIC16F5X
—
—CP
WDTE
FOSC1
FOSC0
bit 11
bit 0
bit 11-4:
Unimplemented: Read as ‘1’
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
00
= LP oscillator
01
= XT oscillator
10
= HS oscillator
11
= RC oscillator
Note 1: Refer to the PIC16F54, PIC16F57 and PIC16F59 Programming Specifications to determine how
to access the Configuration Word. These documents can be found on the Microchip web site at
www.microchip.com.
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = bit is set
‘0’ = bit is cleared
x = bit is unknown
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