參數(shù)資料
型號： PIC16F84
廠商： Microchip Technology Inc.
英文描述： 18-pin Flash/EEPROM 8-Bit Microcontrollers
中文描述： 18引腳閃存/ EEPROM的8位微控制器
文件頁數(shù)： 53/124頁
文件大?。?/td> 1060K
代理商： PIC16F84
PIC16F8X
1998 Microchip Technology Inc.
DS30430C-page 53
8.12.3
WAKE-UP USING INTERRUPTS
When global interrupts are disabled (GIE cleared) and
any interrupt source has both its interrupt enable bit
and interrupt flag bit set, one of the following will occur:
If the interrupt occurs
before
the execution of a
SLEEP
instruction, the
SLEEP
instruction will com-
plete as a NOP. Therefore, the WDT and WDT
postscaler will not be cleared, the TO bit will not
be set and PD bits will not be cleared.
If the interrupt occurs
during or after
the execu-
tion of a
SLEEP
instruction, the device will imme-
diately wake up from sleep. The
SLEEP
instruction
will be completely executed before the wake-up.
Therefore, the WDT and WDT postscaler will be
cleared, the TO bit will be set and the PD bit will
be cleared.
Even if the flag bits were checked before executing a
SLEEP
instruction, it may be possible for flag bits to
become set before the
SLEEP
instruction completes. To
determine whether a
SLEEP
instruction executed, test
the PD bit. If the PD bit is set, the
SLEEP
instruction
was executed as a NOP.
To ensure that the WDT is cleared, a
CLRWDT
instruc-
tion should be executed before a
SLEEP
instruction.
8.13
Program Verification/Code Protection
If the code protection bit(s) have not been
programmed, the on-chip program memory can be
read out for verification purposes.
8.14
ID Locations
Four memory locations (2000h - 2003h) are designated
as ID locations to store checksum or other code
identification numbers. These locations are not
accessible during normal execution but are readable
and writable only during program/verify. Only the
4 least significant bits of ID location are usable.
For ROM devices, these values are submitted along
with the ROM code.
8.15
In-Circuit Serial Programming
PIC16F8X
programmed while in the end application circuit. This is
simply done with two lines for clock and data, and three
other lines for power, ground, and the programming
voltage. Customers can manufacture boards with
unprogrammed devices, and then program the
microcontroller just before shipping the product,
allowing the most recent firmware or custom firmware
to be programmed.
The device is placed into a program/verify mode by
holding the RB6 and RB7 pins low, while raising the
MCLR pin from V
IL
to V
IHH
(see programming
specification). RB6 becomes the programming clock
and RB7 becomes the programming data. Both RB6
and RB7 are Schmitt Trigger inputs in this mode.
After reset, to place the device into programming/verify
mode, the program counter (PC) points to location 00h.
A 6-bit command is then supplied to the device, 14-bits
of program data is then supplied to or from the device,
using load or read-type instructions. For complete
details of serial programming, please refer to the
PIC16CXX Programming Specifications (Literature
#DS30189).
microcontrollers
can
be
serially
FIGURE 8-20: TYPICAL IN-SYSTEM SERIAL
PROGRAMMING
CONNECTION
For ROM devices, both the program memory and Data
EEPROM memory may be read, but only the Data
EEPROM memory may be programmed.
Note:
Microchip does not recommend code pro-
tecting widowed devices.
External
Connector
Signals
To Normal
Connections
To Normal
Connections
PIC16FXX
V
DD
V
SS
MCLR/V
PP
RB6
RB7
+5V
0V
V
PP
CLK
Data I/O
V
DD
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相關代理商/技術參數(shù)
參數(shù)描述
PIC16F84-04/P 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 4MHz PDIP18 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT
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PIC16F84-04/SO 制造商:Microchip Technology Inc 功能描述:IC SM 8-BIT FLASH MCU
PIC16F84-04I/P 功能描述:8位微控制器 -MCU 1.75KB 68 RAM 13 I/O 4MHz Ind Temp PDIP18 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT
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