參數(shù)資料
型號: PIC18LF27J13T-I/SO
廠商: Microchip Technology
文件頁數(shù): 7/16頁
文件大小: 0K
描述: IC MCU 8BIT 128KB FLASH 28SOIC
標(biāo)準(zhǔn)包裝: 1,600
系列: PIC® XLP™ 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 48MHz
連通性: I²C,LIN,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲(chǔ)器容量: 128KB(64K x 16)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 3.8K x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 2.75 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 10x10b/12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
2009-2011 Microchip Technology Inc.
DS39957D-page 111
PIC18F87K90 FAMILY
7.0
FLASH PROGRAM MEMORY
The Flash program memory is readable, writable and
erasable during normal operation over the entire VDD
range.
A read from program memory is executed on one byte
at a time. For execution of a write to, or erasure of,
program memory:
Memory of 32 Kbytes and 64 Kbytes
(PIC18FX5K90 and PIC18FX6K90 devices) –
Blocks of 64 bytes
Memory of 128 Kbytes (PIC18FX7K90 devices) –
Blocks of 128 bytes
Writing or erasing program memory will cease
instruction fetches until the operation is complete. The
program memory cannot be accessed during the write
or erase, therefore, code cannot execute. An internal
programming timer terminates program memory writes
and erases.
A value written to program memory does not need to be
a valid instruction. Executing a program memory
location that forms an invalid instruction results in a
NOP
.
7.1
Table Reads and Table Writes
In order to read and write program memory, there are
two operations that allow the processor to move bytes
between the program memory space and the data RAM:
Table Read (TBLRD)
Table Write (TBLWT)
The program memory space is 16 bits wide, while the
data RAM space is 8 bits wide. Table reads and table
writes move data between these two memory spaces
through an 8-bit register (TABLAT).
Table read operations retrieve data from program
memory and place it into the data RAM space.
Figure 7-1 shows the operation of a table read with
program memory and data RAM.
Table write operations store data from the data memory
space into holding registers in program memory. The
procedure to write the contents of the holding registers
into program memory is detailed in Section 7.5 “Writing
. Figure 7-2 shows the
operation of a table write with program memory and data
RAM.
Table operations work with byte entities. A table block
containing data, rather than program instructions, is not
required to be word-aligned. Therefore, a table block can
start and end at any byte address. If a table write is being
used to write executable code into program memory,
program instructions will need to be word-aligned.
FIGURE 7-1:
TABLE READ OPERATION
Table Pointer(1)
Table Latch (8-bit)
Program Memory
TBLPTRH
TBLPTRL
TABLAT
TBLPTRU
Instruction: TBLRD*
Note 1:
The Table Pointer register points to a byte in program memory.
Program Memory
(TBLPTR)
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