參數(shù)資料
型號： AT89C5115-RATUM
廠商： Atmel
文件頁數(shù)： 83/113頁
文件大?。?/td> 0K
描述： IC 8051 MCU FLASH 16K 32VQFP
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)包裝： 1,250
系列： 89C
核心處理器： 8051
芯體尺寸： 8-位
速度： 40MHz
連通性： UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 20
程序存儲(chǔ)器容量： 16KB（16K x 8）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 32-LQFP
包裝： 托盤
配用： AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
2007-2011 Microchip Technology Inc.
DS70265E-page 71
dsPIC33FJ12MC201/202
7.0
INTERRUPT CONTROLLER
The dsPIC33FJ12MC201/202 interrupt controller
reduces the numerous peripheral interrupt request
signals to a single interrupt request signal to the
dsPIC33FJ12MC201/202 CPU. It has the following
features:
Up to eight processor exceptions and software traps
Seven user-selectable priority levels
Interrupt Vector Table (IVT) with up to 118 vectors
A unique vector for each interrupt or exception
source
Fixed priority within a specified user priority level
Alternate Interrupt Vector Table (AIVT) for debug
support
Fixed interrupt entry and return latencies
7.1
Interrupt Vector Table
The Interrupt Vector Table (IVT) is shown in Figure 7-1.
The IVT resides in program memory, starting at location
000004h. The IVT contains 126 vectors consisting of
eight non-maskable trap vectors, plus up to 118
sources of interrupt. In general, each interrupt source
has its own vector. Each interrupt vector contains a 24-
bit-wide address. The value programmed into each
interrupt vector location is the starting address of the
associated Interrupt Service Routine (ISR).
Interrupt vectors are prioritized in terms of their natural
priority. This priority is linked to their position in the
vector table. Lower addresses generally have a higher
natural priority. For example, the interrupt associated
with vector 0 will take priority over interrupts at any
other vector address.
dsPIC33FJ12MC201/202 devices implement up to 26
unique interrupts and 4 nonmaskable traps. These are
summarized in Table 7-1 and Table 7-2.
7.1.1
ALTERNATE INTERRUPT VECTOR
TABLE
The Alternate Interrupt Vector Table (AIVT) is located
after the IVT, as shown in Figure 7-1. Access to the
AIVT is provided by the ALTIVT control bit
(INTCON2<15>). If the ALTIVT bit is set, all interrupt
and exception processes use the alternate vectors
instead of the default vectors. The alternate vectors are
organized in the same manner as the default vectors.
The AIVT supports debugging by providing a way to
switch between an application and a support
environment without requiring the interrupt vectors to
be reprogrammed. This feature also enables switching
between applications to facilitate evaluation of different
software algorithms at run time. If the AIVT is not
needed, the AIVT should be programmed with the
same addresses used in the IVT.
7.2
Reset Sequence
A device Reset is not a true exception because the
interrupt controller is not involved in the Reset process.
The dsPIC33FJ12MC201/202 device clears its regis-
ters in response to a Reset, forcing the PC to zero. The
digital signal controller then begins program execution
at location 0x000000. A GOTO instruction at the Reset
address can redirect program execution to the
appropriate start-up routine.
Note 1:
This data sheet summarizes the features
of the dsPIC33FJ12MC201/202 family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 6. “Interrupts”
(DS70184) of the “dsPIC33F/PIC24H
Family Reference Manual”
, which is
(www.microchip.com).
2:
Some registers and associated bits
described in this section may not be
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
Note:
Any unimplemented or unused vector
locations in the IVT and AIVT should be
programmed with the address of a default
interrupt handler routine that contains a
RESET
instruction.
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