參數資料
型號： PIC16LF818T-I/SS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 10 MHz, RISC MICROCONTROLLER, PDSO20
封裝： 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件頁數： 103/176頁
文件大?。?/td> 3124K
代理商： PIC16LF818T-I/SS
PIC16F818/819
DS39598E-page 30
2004 Microchip Technology Inc.
3.7
Writing to Flash Program Memory
Flash program memory may only be written to if the
destination address is in a segment of memory that is
not write-protected, as defined in bits WRT1:WRT0 of
the device Configuration Word (Register 12-1). Flash
program memory must be written in four-word blocks.
A block consists of four words with sequential
addresses, with a lower boundary defined by an
address, where EEADR<1:0> = 00. At the same time,
all block writes to program memory are done as write-
only operations. The program memory must first be
erased. The write operation is edge-aligned and cannot
occur across boundaries.
To write to the program memory, the data must first be
loaded into the buffer registers. There are four 14-bit
buffer registers and they are addressed by the low
2 bits of EEADR.
The following sequence of events illustrate how to
perform a write to program memory:
Set the EEPGD and WREN bits in the EECON1
register
Clear the FREE bit in EECON1
Write address to EEADRH:EEADR
Write data to EEDATH:EEDATA
Write 55 to EECON2
Write AA to EECON2
Set WR bit in EECON 1
The user must follow the same specific sequence to
initiate the write for each word in the program block by
writing each program word in sequence (00, 01, 10,
11
).
There are 4 buffer register words and all four locations
MUST be written to with correct data.
After
the
“BSF
EECON1,
WR
”
instruction,
if
EEADR
≠ xxxxxx11, then a short write will occur.
This short write-only transfers the data to the buffer
register. The WR bit will be cleared in hardware after
one cycle.
After
the
“BSF
EECON1,
WR
”
instruction,
if
EEADR = xxxxxx11, then a long write will occur. This
will
simultaneously
transfer
the
data
from
EEDATH:EEDATA to the buffer registers and begin the
write of all four words. The processor will execute the
next instruction and then ignore the subsequent
instruction. The user should place NOP instructions into
the second words. The processor will then halt internal
operations for typically 2 msec in which the write takes
place. This is not a Sleep mode, as the clocks and
peripherals will continue to run. After the write cycle,
the processor will resume operation with the 3rd
instruction after the EECON1 write instruction.
After each long write, the 4 buffer registers will be reset
to 3FFF.
FIGURE 3-1:
BLOCK WRITES TO FLASH PROGRAM MEMORY
14
Program Memory
Buffer Register
EEADR<1:0> = 00
Buffer Register
EEADR<1:0> = 01
Buffer Register
EEADR<1:0> = 10
Buffer Register
EEADR<1:0> = 11
EEDATA
EEDATH
75
07
0
6
8
First word of block
to be written
to Flash
automatically
after this word
is written
transferred
All buffers are
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PIC16LF819-I/MLTSL 功能描述:8位微控制器 -MCU 3.5 KB FL 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC16LF819-I/P 功能描述:8位微控制器 -MCU 3.5KB 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC16LF819-I/PTSL 功能描述:8位微控制器 -MCU 3.5 KB FL 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC16LF819-I/SO 功能描述:8位微控制器 -MCU 3.5KB 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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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