參數(shù)資料
型號(hào)： PIC16LF84A
廠商： Microchip Technology Inc.
英文描述： 18-pin Enhanced Flash/EEPROM 8-Bit Microcontroller
中文描述： 18引腳增強(qiáng)型閃存/ EEPROM的8位微控制器
文件頁(yè)數(shù)： 28/68頁(yè)
文件大?。?/td> 494K
代理商： PIC16LF84A
PIC16F84A
DS35007A-page 28
Preliminary
1998 Microchip Technology Inc.
6.7
Time-out Sequence and Power-down
Status Bits (TO/PD)
On power-up (Figure 6-7, Figure 6-8, Figure 6-9 and
Figure 6-10) the time-out sequence is as follows: First
PWRT time-out is invoked after a POR has expired.
Then the OST is activated. The total time-out will vary
based on oscillator configuration and PWRTE
configuration bit status. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
TABLE 6-5
TIME-OUT IN VARIOUS
SITUATIONS
Since the time-outs occur from the POR reset pulse, if
MCLR is kept low long enough, the time-outs will
expire. Then bringing MCLR high, execution will begin
immediately (Figure 6-7). This is useful for testing
purposes or to synchronize more than one PIC16F84A
device when operating in parallel.
Table 6-6 shows the significance of the TO and PD bits.
Table 6-3 lists the reset conditions for some special
registers, while Table 6-4 lists the reset conditions for
all the registers.
TABLE 6-6
STATUS BITS AND THEIR
SIGNIFICANCE
6.8
Interrupts
The PIC16F84A has 4 sources of interrupt:
External interrupt RB0/INT pin
TMR0 overflow interrupt
PORTB change interrupts (pins RB7:RB4)
Data EEPROM write complete interrupt
The interrupt control register (INTCON) records
individual interrupt requests in flag bits. It also contains
the individual and global interrupt enable bits.
The global interrupt enable bit, GIE (INTCON<7>)
enables (if set) all un-masked interrupts or disables (if
cleared) all interrupts. Individual interrupts can be
disabled through their corresponding enable bits in
INTCON register. Bit GIE is cleared on reset.
The “return from interrupt” instruction,
RETFIE
, exits
interrupt routine as well as sets the GIE bit, which
re-enable interrupts.
The RB0/INT pin interrupt, the RB port change inter-
rupt and the TMR0 overflow interrupt flags are con-
tained in the INTCON register.
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. For external interrupt events, such as the
RB0/INT pin or PORTB change interrupt, the interrupt
latency will be three to four instruction cycles. The
exact latency depends when the interrupt event occurs.
The latency is the same for both one and two cycle
instructions. Once in the interrupt service routine the
source(s) of the interrupt can be determined by polling
the interrupt flag bits. The interrupt flag bit(s) must be
cleared in software before re-enabling interrupts to
avoid infinite interrupt requests.
FIGURE 6-11: INTERRUPT LOGIC
Oscillator
Configuration
Power-up
Wake-up
from
SLEEP
PWRT
Enabled
72 ms +
1024T
OSC
72 ms
PWRT
Disabled
1024T
OSC
XT, HS, LP
1024T
OSC
RC
—
—
TO
PD
Condition
1
0
x
0
0
1
1
1
x
0
1
0
1
0
Power-on Reset
Illegal, TO is set on POR
Illegal, PD is set on POR
WDT Reset (during normal operation)
WDT Wake-up
MCLR Reset during normal operation
MCLR Reset during SLEEP or interrupt
wake-up from SLEEP
Note 1:
Individual interrupt flag bits are set
regardless
of
corresponding mask bit or the GIE bit.
the
status
of
their
RBIF
RBIE
T0IF
T0IE
INTF
INTE
GIE
EEIE
Wake-up
(If in SLEEP mode)
Interrupt to CPU
EEIF
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PIC16LF84A-04/P 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 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
PIC16LF84A-04/P 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC
PIC16LF84A-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 制造商:Microchip Technology Inc 功能描述:IC, 8BIT FLASH MCU
PIC16LF84A-04/SO 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 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
PIC16LF84A-04/SS 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 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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