PIC24FJ256GB110-I/PF Microchip Technology, PIC24FJ256GB110-I/PF Datasheet - Page 22

• Manufacturer Part Number: PIC24FJ256GB110-I/PF
• Description: IC PIC MCU FLASH 256K 100TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 24Fr

Specifications of PIC24FJ256GB110-I/PF

• Program Memory Type: FLASH
• Program Memory Size: 256KB (85.5K x 24)
• Package / Case: 100-TQFP, 100-VQFP
• Core Processor: PIC
• Core Size: 16-Bit
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 83
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC24FJ
• Core: PIC
• Data Bus Width: 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C/SPI/UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 84
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DM240001, DM240011
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 876-1004 - PIC24 BREAKOUT BOARDDM240001 - BOARD DEMO PIC24/DSPIC33/PIC32
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC24FJXXXGA1/GB1
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 3-9 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 3-9:
DS39907A-page 22
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: Repeat Step 4 until all desired code memory is read.
Step 6: Reset device internal PC.
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
© 2007 Microchip Technology Inc.