PIC24F16KA101T-I/MQ Microchip Technology, PIC24F16KA101T-I/MQ Datasheet - Page 33

• Manufacturer Part Number: PIC24F16KA101T-I/MQ
• Description: 16KB Flash, 2KB RAM, 512B EEPROM, 16 MIPS, 16 I/O,16-bit PIC24F Family, NanoWatt
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 24Fr

Specifications of PIC24F16KA101T-I/MQ

• Core Processor: PIC
• Core Size: 16-Bit
• Speed: 32MHz
• Connectivity: I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Size: 16KB (5.5K x 24)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.1.3
The programming executive does not use the Watch-
dog Timer or time-out for transmitting responses to the
programmer. If the programmer does not follow the flow
control mechanism using PGCx, as described in
Section 5.1.1 “Communication Interface and Proto-
col”, it is possible that the programming executive will
behave unexpectedly while trying to send a response
to the programmer. Since the programming executive
does not have a time-out, it is imperative that the pro-
grammer correctly follow the described communication
protocol.
FIGURE 5-3:
5.2
The programming executive command set is listed in
Table 5-1. This table contains the opcode, mnemonic,
length, time-out and description for each command.
Section 5.2.4 “Command Descriptions” provides
functional details on each command.
5.2.1
The programming executive commands have a
general format consisting of a 16-bit header and any
required data for the command (see Figure 5-4). The
16-bit header consists of a 4-bit opcode field, which is
used to identify the command, followed by a 12-bit
command length field.
FIGURE 5-4:
© 2008 Microchip Technology Inc.
15
Opcode
Command Data First Word (if required)
Command Data Last Word (if required)
PGCx
PGDx
Programming Executive
Commands
12
TIME-OUTS
COMMAND FORMAT
11
MSB X X X LSB
1
Last Command Word
PGCx = Input
PGDx = Input
2
Host Transmits
PROGRAMMING EXECUTIVE – PROGRAMMER COMMUNICATION PROTOCOL
COMMAND FORMAT
15 16
•
•
Length
P8
Advance Information
PGCx = Input (Idle)
Programming Executive
Processes Command
P9
PGDx = Output
1
0
0
P20
As a safety measure, the programmer should use the
command time-outs identified and listed in Table 5-1. If
the command time-out expires, the programmer should
reset
programming the device again.
The command opcode must match one of those in the
command set. Any command that is received that does
not match the list in Table 5-1 returns a “NACK”
response (see Section 5.3.1.1 “Opcode Field”).
The command length is represented in 16-bit words as
the SPI operates in 16-bit mode. The programming
executive uses the command length field to determine
the number of words to read from the SPI port. If the
value of this field is incorrect, the command will not be
properly received by the programming executive.
MSB X X X LSB
the
1
PIC24FXXKAXXX
2
Host Clocks Out Response
programming
15 16
PGCx = Input
PGDx = Output
P21
MSB X X X LSB
1
executive
2
DS39919A-page 33
15 16
and
start