參數(shù)資料
型號(hào)： AT90LS8535-4AI
廠商： Atmel
文件頁數(shù)： 86/127頁
文件大?。?/td> 0K
描述： IC MCU 8K 4MHZ A/D LV IT 44TQFP
標(biāo)準(zhǔn)包裝： 160
系列： AVR® 90LS
核心處理器： AVR
芯體尺寸： 8-位
速度： 4MHz
連通性： SPI，UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 8KB（4K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大小： 512 x 8
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-TQFP
包裝： 托盤
1997 Microchip Technology Inc.
DS30272A-page 61
PIC16C71X
8.5
Interrupts
The PIC16C71X family has 4 sources of interrupt.
The interrupt control register (INTCON) records indi-
vidual interrupt requests in ag bits. It also has individ-
ual and global interrupt enable bits.
A global interrupt enable bit, GIE (INTCON<7>)
enables (if set) all un-masked interrupts or disables (if
cleared) all interrupts. When bit GIE is enabled, and an
interrupt’s ag bit and mask bit are set, the interrupt will
vector immediately. Individual interrupts can be dis-
abled through their corresponding enable bits in vari-
ous
registers.
Individual
interrupt
bits
are
set
regardless of the status of the GIE bit. The GIE bit is
cleared on reset.
The “return from interrupt” instruction, RETFIE, exits
the interrupt routine as well as sets the GIE bit, which
re-enables interrupts.
The RB0/INT pin interrupt, the RB port change inter-
rupt and the TMR0 overow interrupt ags are con-
tained in the INTCON register.
The peripheral interrupt ags are contained in the spe-
cial function registers PIR1 and PIR2. The correspond-
ing interrupt enable bits are contained in special
function registers PIE1 and PIE2, and the peripheral
interrupt enable bit is contained in special function reg-
ister INTCON.
When an interrupt is responded to, the GIE bit is
cleared to disable any further interrupt, the return
address is pushed onto the stack and the PC is loaded
with 0004h. Once in the interrupt service routine the
source(s) of the interrupt can be determined by polling
the interrupt ag bits. The interrupt ag bit(s) must be
cleared in software before re-enabling interrupts to
avoid recursive interrupts.
Applicable Devices
710 71 711 715
Interrupt Sources
External interrupt RB0/INT
TMR0 overow interrupt
PORTB change interrupts (pins RB7:RB4)
A/D Interrupt
Note:
Individual interrupt ag bits are set regard-
less of the status of their corresponding
mask bit or the GIE bit.
For external interrupt events, such as the INT pin or
PORTB change interrupt, the interrupt latency will be
three or four instruction cycles. The exact latency
depends when the interrupt event occurs (Figure 8-19).
The latency is the same for one or two cycle instruc-
tions. Individual interrupt ag bits are set regardless of
the status of their corresponding mask bit or the GIE
bit.
Note:
For the PIC16C71
If an interrupt occurs while the Global Inter-
rupt Enable (GIE) bit is being cleared, the
GIE bit may unintentionally be re-enabled
by the user’s Interrupt Service Routine (the
RETFIE
instruction). The
events
that
would cause this to occur are:
1.
An instruction clears the GIE bit while
an interrupt is acknowledged.
2.
The program branches to the Interrupt
vector and executes the Interrupt Ser-
vice Routine.
3.
The Interrupt Service Routine com-
pletes with the execution of the RET-
FIE
instruction. This causes the GIE
bit to be set (enables interrupts), and
the program returns to the instruction
after the one which was meant to dis-
able interrupts.
Perform the following to ensure that inter-
rupts are globally disabled:
LOOP BCF
INTCON, GIE
; Disable global
;
interrupt bit
BTFSC INTCON, GIE
; Global interrupt
;
disabled?
GOTO
LOOP
; NO, try again
:
;
Yes, continue
;
with program
;
flow
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AT90LS8535-4JC 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 8K Bytes In-System Programmable Flash
AT90LS8535-4JI 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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AT90LS8535-4PC 功能描述:8位微控制器 -MCU 8k bit RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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