PIC24FJ64GB004-I/ML Microchip Technology, PIC24FJ64GB004-I/ML Datasheet - Page 20

• Manufacturer Part Number: PIC24FJ64GB004-I/ML
• Description: IC, 16BIT MCU, PIC24F, 32MHZ, QFN-44
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 24Fr

Specifications of PIC24FJ64GB004-I/ML

• Controller Family/series: PIC24
• Ram Memory Size: 8KB
• Cpu Speed: 32MHz
• No. Of Timers: 5
• Interface: I2C, LIN, SPI, UART, USB
• No. Of Pwm Channels: 5
• Core Size: 16 Bit
• Program Memory Size: 64 KB
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, IrDA, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-QFN
• Embedded Interface Type: I2C, LIN, SPI, UART, USB
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 876-1004 - PIC24 BREAKOUT BOARD
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC24FJ64GA1/GB0
3.8
Reading from code memory is performed by executing
a series of TBLRD instructions and clocking out the data
using the REGOUT command.
Table 3-8 shows the ICSP programming details for
reading code memory. In Step 1, the Reset vector is
exited. In Step 2, the 24-bit starting source address for
reading is loaded into the TBLPAG register and W6
register. The upper byte of the starting source address
is stored in TBLPAG and the lower 16 bits of the source
address are stored in W6.
TABLE 3-8:
DS39934B-page 20
Step 1: Exit Reset vector.
Step 2: Initialize TBLPAG and the Read Pointer (W6) for TBLRD instruction.
Step 3: Initialize the Write Pointer (W7) to point to the VISI register.
Step 4: Read and clock out the contents of the next two locations of code memory, through the VISI register, using
Step 5: Reset device internal PC.
Step 6: Repeat Steps 4 and 5 until all desired code memory is read.
Command
(Binary)
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0001
0000
0000
0000
0000
0000
0000
0000
0001
0000
0000
0000
0000
0001
0000
0000
0000
Reading Code Memory
the REGOUT command.
SERIAL INSTRUCTION EXECUTION FOR READING CODE MEMORY
000000
040200
000000
200xx0
880190
2xxxx6
207847
000000
BA0B96
000000
000000
<VISI>
000000
BADBB6
000000
000000
BAD3D6
000000
000000
<VISI>
000000
BA0BB6
000000
000000
<VISI>
000000
040200
000000
(Hex)
Data
NOP
GOTO
NOP
MOV
MOV
MOV
MOV
NOP
TBLRDL
NOP
NOP
Clock out contents of VISI register
NOP
TBLRDH.B
NOP
NOP
TBLRDH.B
NOP
NOP
Clock out contents of VISI register
NOP
TBLRDL
NOP
NOP
Clock out contents of VISI register
NOP
GOTO
NOP
0x200
#<SourceAddress23:16>, W0
W0, TBLPAG
#<SourceAddress15:0>, W6
#VISI, W7
[W6], [W7]
[W6++], [W7++]
[++W6], [W7--]
[W6++], [W7]
0x200
To minimize the reading time, the packed instruction
word format that was utilized for writing is also used for
reading (see Figure 3-6). In Step 3, the Write Pointer,
W7, is initialized. In Step 4, two instruction words are
read from code memory and clocked out of the device,
through the VISI register, using the REGOUT
command. Step 4 is repeated until the desired amount
of code memory is read.
Description
© 2009 Microchip Technology Inc.