參數(shù)資料
型號(hào): PIC18F25K20-I/ML
廠商: Microchip Technology
文件頁(yè)數(shù): 9/42頁(yè)
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 16KX16 28QFN
產(chǎn)品培訓(xùn)模塊: PIC18 K-Series
XLP Deep Sleep Mode
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 61
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(cè)/復(fù)位,HLVD,POR,PWM,WDT
輸入/輸出數(shù): 24
程序存儲(chǔ)器容量: 32KB(16K x 16)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 1.5K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 11x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-VQFN 裸露焊盤
包裝: 管件
產(chǎn)品目錄頁(yè)面: 656 (CN2011-ZH PDF)
配用: AC164112-ND - VOLTAGE LIMITER MPLAB ICD2 VPP
AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
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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