PIC24H Microchip Technology, PIC24H Datasheet - Page 50

• Manufacturer Part Number: PIC24H
• Description: Flash Programming Specification
• Manufacturer: Microchip Technology

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION
4.2.6
The READC command instructs the programming exec-
utive to read N Configuration registers or Device ID
registers, starting from the 24-bit address specified by
Addr_MSB and Addr_LS. This command can only be
used to read 8-bit or 16-bit data.
When this command is used to read Configuration
registers, the upper byte in every data word returned by
the programming executive is 0x00 and the lower byte
contains the Configuration register value.
Expected Response (4 + 3 * (N – 1)/2 words
for N odd):
0x1100
2 + N
Configuration register or Device ID Register 1
...
Configuration register or Device ID Register N
DS70152D-page 50
15
Opcode
Length
N
Addr_MSB
Addr_LS
Note:
Opcode
Field
12 11
READC COMMAND
Reading unimplemented memory will
cause the programming executive to
reset. Please ensure that only memory
locations present on a particular device
are accessed.
N
0x1
0x3
Number of 8-bit Configuration registers
or Device ID registers to read (max of
256)
MSB of 24-bit source address
Least Significant 16 bits of 24-bit
source address
Addr_LS
8 7
Description
Length
Addr_MSB
Preliminary
0
4.2.7
The READP command instructs the programming exec-
utive to read N 24-bit words of code memory, starting
from the 24-bit address specified by Addr_MSB and
Addr_LS. This command can only be used to read 24-
bit data. All data returned in the response to this com-
mand uses the packed data format described in
Section 4.2.2 “Packed Data Format”.
Expected Response (2 + 3 * N/2 words for N even):
0x1200
2 + 3 * N/2
Least significant program memory word 1
...
Least significant data word N
Expected Response (4 + 3 * (N – 1)/2 words
for N odd):
0x1200
4 + 3 * (N – 1)/2
Least significant program memory word 1
...
MSB of program memory word N (zero padded)
15
Opcode
Length
N
Reserved
Addr_MSB
Addr_LS
Note:
Opcode
Field
Reserved
12 11
READP COMMAND
Reading unimplemented memory will
cause the programming executive to
reset. Please ensure that only memory
locations present on a particular device
are accessed.
0x2
0x4
Number of 24-bit instructions to read
(max of 32768)
0x0
MSB of 24-bit source address
Least Significant 16 bits of 24-bit
source address
Addr_LS
© 2007 Microchip Technology Inc.
8 7
N
Description
Length
Addr_MSB
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