參數(shù)資料
型號: PIC24HJ64GP502-I/MM
廠商: Microchip Technology
文件頁數(shù): 2/84頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 64K 28-QFN
標(biāo)準(zhǔn)包裝: 61
系列: PIC® 24H
核心處理器: PIC
芯體尺寸: 16-位
速度: 40 MIP
連通性: CAN,I²C,IrDA,LIN,PMP,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,DMA,POR,PWM,WDT
輸入/輸出數(shù): 21
程序存儲器容量: 64KB(22K x 24)
程序存儲器類型: 閃存
RAM 容量: 8K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 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-VQFN 裸露焊盤
包裝: 管件
產(chǎn)品目錄頁面: 648 (CN2011-ZH PDF)
配用: AC164336-ND - MODULE SOCKET FOR PM3 28/44QFN
dsPIC33F/PIC24H PROGRAMMING SPECIFICATION
DS70152H-page 10
2010 Microchip Technology Inc.
FIGURE 3-3:
ENTERING ENHANCED ICSP MODE
3.4
Blank Check
The term “Blank Check” implies verifying that the
device has been successfully erased and has no
programmed memory locations. A blank or erased
memory location is always read as ‘1’.
The Device ID registers (0xFF0000:0xFF0002) can be
ignored by the Blank Check since this region stores
device information that cannot be erased. The device
Configuration registers are also ignored by the Blank
Check. Additionally, all unimplemented memory space
should be ignored from the Blank Check.
The QBLANK command is used for the Blank Check. It
determines if the code memory is erased by testing
these memory regions. A ‘BLANK’ or ‘NOT BLANK’
response is returned. If it is determined that the device
is not blank, it must be erased before attempting to
program the chip.
3.5
Code Memory Programming
3.5.1
PROGRAMMING METHODOLOGY
Code memory is programmed with the PROGP
command. PROGP programs one row of code memory
starting from the memory address specified in the
command. The number of PROGP commands required
to program a device depends on the number of write
blocks that must be programmed in the device.
A flowchart for programming code memory is illustrated
in Figure 3-4. In this example, all 88K instruction words
of a dsPIC33F/PIC24H device are programmed. First,
the
number
of
commands
to
send
(called
‘RemainingCmds’ in the flowchart) is set to 1368 and
the destination address (called ‘BaseAddress’) is set to
‘0’. Next, one write block in the device is programmed
with a PROGP command. Each PROGP command
contains data for one row of code memory of the
dsPIC33F/PIC24H. After the first command is
processed
successfully,
‘RemainingCmds’
is
decremented by ‘1’ and compared with ‘0’. Since there
are more PROGP commands to send, ‘BaseAddress’ is
incremented by 0x80 to point to the next row of
memory.
On the second PROGP command, the second row is
programmed. This process is repeated until the entire
device is programmed.
MCLR
PGDx
PGCx
VDD
P6
P14
b31 b30 b29
b28
b27
b2
b1
b0
b3
...
Program/Verify Entry Code = 0x4D434850
P1A
P1B
P18
P19
0
1
001
0
P7
VIH
Note:
If a bootloader needs to be programmed,
the bootloader code must not be
programmed into the first page of code
memory. For example, if a bootloader
located at address 0x200 attempts to
erase the first page, it would inadvertently
erase
itself.
Instead,
program
the
bootloader into the second page (e.g.,
0x400).
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