參數(shù)資料
型號: PIC24FJ48GA004-I/ML
廠商: Microchip Technology
文件頁數(shù): 18/52頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 48K 44-QFN
產(chǎn)品培訓模塊: Graphics LCD System and PIC24 Interface
Asynchronous Stimulus
特色產(chǎn)品: PIC24FJ/33FJ MCUs & dsPIC? DSCs
標準包裝: 45
系列: PIC® 24F
核心處理器: PIC
芯體尺寸: 16-位
速度: 32MHz
連通性: I²C,PMP,SPI,UART/USART
外圍設備: 欠壓檢測/復位,LVD,POR,PWM,WDT
輸入/輸出數(shù): 35
程序存儲器容量: 48KB(16K x 24)
程序存儲器類型: 閃存
RAM 容量: 8K x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 3.6 V
數(shù)據(jù)轉換器: A/D 13x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-VQFN 裸露焊盤
包裝: 管件
配用: 876-1004-ND - PIC24 BREAKOUT BOARD
DM240011-ND - KIT STARTER MPLAB FOR PIC24F MCU
AC162088-ND - HEADER MPLAB ICD2 24FJ64GA004 28
AC164336-ND - MODULE SOCKET FOR PM3 28/44QFN
DV164033-ND - KIT START EXPLORER 16 MPLAB ICD2
2008 Microchip Technology Inc.
DS39768D-page 25
PIC24FJXXXGA0XX
3.10
Verify Code Memory and
Configuration Word
The verify step involves reading back the code memory
space and comparing it against the copy held in the
programmer’s buffer. The Configuration registers are
verified with the rest of the code.
The verify process is shown in the flowchart in
Figure 3-8. Memory reads occur a single byte at a time,
so two bytes must be read to compare against the word
in the programmer’s buffer. Refer to Section 3.8
“Reading Code Memory” for implementation details
of reading code memory.
FIGURE 3-8:
VERIFY CODE
MEMORY FLOW
3.11
Reading the Application ID Word
The Application ID Word is stored at address 8005BEh
in executive code memory. To read this memory
location, you must use the SIX control code to move
this program memory location to the VISI register.
Then, the REGOUT control code must be used to clock
the contents of the VISI register out of the device. The
corresponding control and instruction codes that must
be serially transmitted to the device to perform this
operation are shown in Table 3-10.
After the programmer has clocked out the Application
ID Word, it must be inspected. If the Application ID has
the value, BBh, the programming executive is resident
in memory and the device can be programmed using
the mechanism described in Section 4.0 “Device
Application ID has any other value, the programming
executive is not resident in memory; it must be loaded
to memory before the device can be programmed. The
procedure for loading the programming executive to
memory is described in Section 5.4 “Programming
3.12
Exiting ICSP Mode
Exiting Program/Verify mode is done by removing VIH
from MCLR, as shown in Figure 3-9. The only require-
ment for exit is that an interval, P16, should elapse
between the last clock and program signals on PGCx
and PGDx before removing VIH.
FIGURE 3-9:
EXITING ICSP MODE
Note:
Because
the
Configuration
registers
include the device code protection bit,
code memory should be verified immedi-
ately after writing if code protection is
enabled. This is because the device will
not be readable or verifiable if a device
Reset occurs after the code-protect bit in
CW1 has been cleared.
Read Low Byte
Read High Byte
Does
Word = Expect
Data?
Failure,
Report
Error
All
code memory
verified?
No
Yes
No
Set TBLPTR = 0
Start
Yes
Done
with Post-Increment
MCLR
P16
PGDx
PGD = Input
PGCx
VDD
VIH
P17
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