参数资料
型号: PIC18F2321-E/SS
厂商: Microchip Technology
文件页数: 94/110页
文件大小: 0K
描述: IC PIC MCU FLASH 4KX16 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 47
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 25MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 25
程序存储器容量: 8KB(4K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 4.2 V ~ 5.5 V
数据转换器: A/D 10x10b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
PIC18F2221/2321/4221/4321 FAMILY
DS39689F-page 84
2009 Microchip Technology Inc.
7.4
Erasing Flash Program Memory
The minimum erase block is 32 words or 64 bytes. Only
through the use of an external programmer, or through
ICSP control, can larger blocks of program memory be
bulk erased. Word erase in the Flash array is not
supported.
When initiating an erase sequence from the micro-
controller itself, a block of 64 bytes of program memory
is erased. The Most Significant 16 bits of the
TBLPTR<21:6> point to the block being erased.
TBLPTR<5:0> are ignored.
The EECON1 register commands the erase operation.
The EEPGD bit must be set to point to the Flash
program memory. The WREN bit must be set to enable
write operations. The FREE bit is set to select an erase
operation.
For protection, the write initiate sequence for EECON2
must be used.
A long write is necessary for erasing the internal Flash.
Instruction execution is halted while in a long write
cycle. The long write will be terminated by the internal
programming timer.
7.4.1
FLASH PROGRAM MEMORY
ERASE SEQUENCE
The sequence of events for erasing a block of internal
program memory location is:
1.
Load Table Pointer register with address of row
being erased.
2.
Set the EECON1 register for the erase operation:
set EEPGD bit to point to program memory;
clear the CFGS bit to access program memory;
set WREN bit to enable writes;
set FREE bit to enable the erase.
3.
Disable interrupts.
4.
Write 55h to EECON2.
5.
Write 0AAh to EECON2.
6.
Set the WR bit. This will begin the row erase
cycle.
7.
The CPU will stall for duration of the erase
(about 2 ms using internal timer).
8.
Re-enable interrupts.
EXAMPLE 7-2:
ERASING A FLASH PROGRAM MEMORY ROW
MOVLW
CODE_ADDR_UPPER
; load TBLPTR with the base
MOVWF
TBLPTRU
; address of the memory block
MOVLW
CODE_ADDR_HIGH
MOVWF
TBLPTRH
MOVLW
CODE_ADDR_LOW
MOVWF
TBLPTRL
ERASE_ROW
BSF
EECON1, EEPGD
; point to Flash program memory
BCF
EECON1, CFGS
; access Flash program memory
BSF
EECON1, WREN
; enable write to memory
BSF
EECON1, FREE
; enable Row Erase operation
BCF
INTCON, GIE
; disable interrupts
Required
MOVLW
55h
Sequence
MOVWF
EECON2
; write 55h
MOVLW
0AAh
MOVWF
EECON2
; write 0AAh
BSF
EECON1, WR
; start erase (CPU stall)
BSF
INTCON, GIE
; re-enable interrupts
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