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  • 參數(shù)資料
    型號: PIC18F44K20T-I/PT
    廠商: Microchip Technology
    文件頁數(shù): 9/42頁
    文件大?。?/td> 0K
    描述: IC PIC MCU FLASH 8KX16 44TQFP
    產(chǎn)品培訓(xùn)模塊: PIC18 K-Series
    標準包裝: 1,200
    系列: PIC® XLP™ 18F
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 64MHz
    連通性: I²C,SPI,UART/USART
    外圍設(shè)備: 欠壓檢測/復(fù)位,HLVD,POR,PWM,WDT
    輸入/輸出數(shù): 35
    程序存儲器容量: 16KB(8K x 16)
    程序存儲器類型: 閃存
    EEPROM 大?。?/td> 256 x 8
    RAM 容量: 768 x 8
    電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 14x10b
    振蕩器型: 內(nèi)部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 44-TQFP
    包裝: 帶卷 (TR)
    配用: AC164112-ND - VOLTAGE LIMITER MPLAB ICD2 VPP
    DM164124-ND - KIT STARTER FOR PIC18F4XK20
    其它名稱: PIC18F44K20T-I/PTTR
    2009 Microchip Technology Inc.
    Advance Information
    DS41297F-page 17
    PIC18F2XK20/4XK20
    3.2
    Code Memory Programming
    Programming code memory is accomplished by first
    loading data into the write buffer and then initiating a
    programming sequence. The write and erase buffer
    sizes shown in Table 3-4 can be mapped to any loca-
    tion of the same size beginning at 000000h. The actual
    memory write sequence takes the contents of this buf-
    fer and programs the proper amount of code memory
    that contains the Table Pointer.
    The programming duration is externally timed and is
    controlled by PGC. After a Start Programming
    command is issued (4-bit command, ‘1111’), a NOP is
    issued, where the 4th PGC is held high for the duration
    of the programming time, P9.
    After PGC is brought low, the programming sequence
    is terminated. PGC must be held low for the time
    specified by parameter P10 to allow high-voltage
    discharge of the memory array.
    The code sequence to program a PIC18F2XK20/
    4XK20 device is shown in Table 3-5. The flowchart
    shown in Figure 3-4 depicts the logic necessary to
    completely write a PIC18F2XK20/4XK20 device. The
    timing diagram that details the Start Programming
    command and parameters P9 and P10 is shown in
    TABLE 3-4:
    WRITE AND ERASE BUFFER SIZES
    TABLE 3-5:
    WRITE CODE MEMORY CODE SEQUENCE
    Note:
    The TBLPTR register must point to the
    same region when initiating the program-
    ming sequence as it did when the write
    buffers were loaded.
    Devices (Arranged by Family)
    Write Buffer Size
    (bytes)
    Erase Size (bytes)
    PIC18F26K20, PIC18F46K20
    64
    PIC18F24K20, PIC18F25K20, PIC18F44K20, PIC18F45K20
    32
    64
    PIC18F23K20, PIC18F43K20
    16
    64
    4-bit
    Command
    Data Payload
    Core Instruction
    Step 1: Direct access to code memory.
    0000
    8E A6
    9C A6
    84 A6
    BSF
    EECON1, EEPGD
    BCF
    EECON1, CFGS
    BSF
    EECON1, WREN
    Step 2: Point to row to write.
    0000
    0E <Addr[21:16]>
    6E F8
    0E <Addr[15:8]>
    6E F7
    0E <Addr[7:0]>
    6E F6
    MOVLW <Addr[21:16]>
    MOVWF TBLPTRU
    MOVLW <Addr[15:8]>
    MOVWF TBLPTRH
    MOVLW <Addr[7:0]>
    MOVWF TBLPTRL
    Step 3: Load write buffer. Repeat for all but the last two bytes.
    1101
    <MSB><LSB>
    Write 2 bytes and post-increment address by 2.
    Step 4: Load write buffer for last two bytes and start programming.
    1111
    0000
    <MSB><LSB>
    00 00
    Write 2 bytes and start programming.
    NOP - hold PGC high for time P9 and low for time P10.
    To continue writing data, repeat steps 2 through 4, where the Address Pointer is incremented by 2 at each iteration of
    the loop.
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