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參數(shù)資料
| 型號： | ADUC831BS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU |
| 中文描述： | 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | PLASTIC, MQFP-52 |
| 文件頁數(shù)： | 60/76頁 |
| 文件大?。?/td> | 1211K |
| 代理商： | ADUC831BS |
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REV. 0
–60–
ADuC831
Interrupt Priority
The Interrupt Enable registers are written by the user to enable
individual interrupt sources, while the Interrupt Priority registers
allow the user to select one of two priority levels for each interrupt.
An interrupt of a high priority may interrupt the service routine
of a low priority interrupt, and if two interrupts of different
priority occur at the same time, the higher level interrupt will be
serviced first. An interrupt cannot be interrupted by another
interrupt of the same priority level. If two interrupts of the same
priority level occur simultaneously, a polling sequence is observed
as shown in Table XXXI.
Table XXXI. Priority within an Interrupt Level
Source
Priority
Description
PSMI
WDS
IE0
ADCI
TF0
IE1
TF1
I2CI + ISPI
RI + TI
TF2 + EXF2 9 (Lowest)
TII
1 (Highest)
2
2
3
4
5
6
7
8
Power Supply Monitor Interrupt
Watchdog Timer Interrupt
External Interrupt 0
ADC Interrupt
Timer/Counter 0 Interrupt
External Interrupt 1
Timer/Counter 1 Interrupt
SPI Interrupt
Serial Interrupt
Timer/Counter 2 Interrupt
Time Interval Counter Interrupt
11 (Lowest)
Interrupt Vectors
When an interrupt occurs, the program counter is pushed onto
the stack and the corresponding interrupt vector address is
loaded into the program counter. The Interrupt Vector Addresses
are shown in Table XXXII.
Table XXXII. Interrupt Vector Addresses
Source
Vector Address
IE0
TF0
IE1
TF1
RI + TI
TF2 + EXF2
ADCI
I2CI + ISPI
PSMI
TII
WDS
0003H
000BH
0013H
001BH
0023H
002BH
0033H
003BH
0043H
0053H
005BH
ADuC831 HARDWARE DESIGN CONSIDERATIONS
This section outlines some of the key hardware design consider-
ations that must be addressed when integrating the ADuC831
into any hardware system.
Clock Oscillator
The clock source for the ADuC831 can come either from an
external source or from the internal clock oscillator. To use the
internal clock oscillator, connect a parallel resonant crystal between
XTAL1 and XTAL2, and connect a capacitor from each pin to
ground as shown below.
XTAL2
XTAL1
TO INTERNAL
TIMNG CIRCUITS
ADuC831
Figure 55. External Parallel Resonant Crystal Connections
XTAL2
XTAL1
TO INTERNAL
TIMNG CIRCUITS
ADuC831
EXTERNAL
CLOCK
SOURCE
Figure 56. Connecting an External Clock Source
Whether using the internal oscillator or an external clock
source, the ADuC831’s specified operational clock speed range is
400 kHz to 16 MHz. The core itself is static, and will function
all the way down to dc. But at clock speeds slower that 400 kHz
the ADC will no longer function correctly. Therefore, to ensure
specified operation, use a clock frequency of at least 400 kHz
and no more than 16 MHz. Note: the Flash/EE memory may
not program correctly at a clock frequency of less than 2 MHz.
External Memory Interface
In addition to its internal program and data memories, the ADuC831
can access up to 64 kBytes of external program memory (ROM/
PROM/etc.) and up to 16 MBytes of external data memory (SRAM).
To select from which code space (internal or external program
memory) to begin executing instructions, tie the
EA
(external
access) pin high or low, respectively. When
EA
is high (pulled up
to V
DD
), user program execution will start at address 0 of the
internal 62 kBytes Flash/EE code space. When
EA
is low (tied
to ground) user program execution will start at address 0 of the
external code space.
A second very important function of the
EA
pin is described
in the Single Pin Emulation Mode section.
External program memory (if used) must be connected to the
ADuC831 as illustrated in Figure 57. Note that 16 I/O lines
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| ADUC831BS-REEL | 制造商:Analog Devices 功能描述:MCU 8-bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP T/R |
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| ADUC832BCP | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3V/5V 56-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 16.78MHZ 3.3/5V 56LFCSP - Bulk |
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