PIC24FJ64GA004T-I/ML Microchip Technology, PIC24FJ64GA004T-I/ML Datasheet - Page 188
![64KB, Flash, 8192bytes-RAM, 16MIPS, 35I/O, 16-bit Family,nanoWatt 44 QFN 8x8x0.9](/photos/6/81/68122/150-44-qfn_sml.jpg)
PIC24FJ64GA004T-I/ML
Manufacturer Part Number
PIC24FJ64GA004T-I/ML
Description
64KB, Flash, 8192bytes-RAM, 16MIPS, 35I/O, 16-bit Family,nanoWatt 44 QFN 8x8x0.9
Manufacturer
Microchip Technology
Series
PIC® 24Fr
Datasheets
1.PIC24FJ16GA002-ISS.pdf
(52 pages)
2.PIC24FJ16GA002-ISS.pdf
(268 pages)
3.PIC24FJ16GA002-ISS.pdf
(22 pages)
Specifications of PIC24FJ64GA004T-I/ML
Core Processor
PIC
Core Size
16-Bit
Speed
32MHz
Connectivity
I²C, PMP, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
64KB (22K x 24)
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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
DM240011 - KIT STARTER MPLAB FOR PIC24F MCUAC162088 - HEADER MPLAB ICD2 24FJ64GA004 28AC164336 - MODULE SOCKET FOR PM3 28/44QFNDV164033 - KIT START EXPLORER 16 MPLAB ICD2
Eeprom Size
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
PIC24FJ64GA004T-I/MLTR
- PIC24FJ16GA002-ISS PDF datasheet
- PIC24FJ16GA002-ISS PDF datasheet #2
- PIC24FJ16GA002-ISS PDF datasheet #3
- Current page: 188 of 268
- Download datasheet (2Mb)
PIC24FJ64GA004 FAMILY
FIGURE 20-2:
20.1
20.1.1
To start serial shifting, a ‘1’ must be written to the
CRCGO bit.
The module incorporates a FIFO that is 8 deep when
PLEN (PLEN<3:0>) > 7, and 16 deep, otherwise. The
data for which the CRC is to be calculated must first be
written into the FIFO. The smallest data element that
can be written into the FIFO is one byte. For example,
if PLEN = 5, then the size of the data is PLEN + 1 = 6.
The data must be written as follows:
Once data is written into the CRCWDAT MSb (as
defined by PLEN), the value of the VWORD bits
(CRCCON<12:8>) increments by one. The serial
shifter starts shifting data into the CRC engine when
CRCGO = 1 and VWORD > 0. When the MSb is
shifted out, VWORD decrements by one. The serial
shifter continues shifting until the VWORD reaches 0.
Therefore, for a given value of PLEN, it will take
(PLEN + 1) * VWORD number of clock cycles to
complete the CRC calculations.
When VWORD reaches 8 (or 16), the CRCFUL bit will
be set. When VWORD reaches 0, the CRCMPT bit will
be set.
To continually feed data into the CRC engine, the rec-
ommended mode of operation is to initially “prime” the
FIFO with a sufficient number of words so no interrupt
is generated before the next word can be written. Once
that is done, start the CRC by setting the CRCGO bit to
‘1’. From that point onward, the VWORD bits should be
polled. If they read less than 8 or 16, another word can
be written into the FIFO.
DS39881D-page 188
SDOx
XOR
User Interface
DATA INTERFACE
D
data[5:0] = crc_input[5:0]
BIT 0
p_clk
Q
data[7:6] = ‘bxx
CRC GENERATOR RECONFIGURED FOR x
D
p_clk
BIT 4
Q
D
BIT 5
p_clk
Q
To empty words already written into a FIFO, the
CRCGO bit must be set to ‘1’ and the CRC shifter
allowed to run until the CRCMPT bit is set.
Also, to get the correct CRC reading, it will be
necessary to wait for the CRCMPT bit to go high before
reading the CRCWDAT register.
If a word is written when the CRCFUL bit is set, the
VWORD Pointer will roll over to 0. The hardware will
then behave as if the FIFO is empty. However, the con-
dition to generate an interrupt will not be met; therefore,
no interrupt will be generated (See Section 20.1.2
“Interrupt Operation”).
At least one instruction cycle must pass after a write to
CRCWDAT before a read of the VWORD bits is done.
20.1.2
When the VWORD4:VWORD0 bits make a transition
from a value of ‘1’ to ‘0’, an interrupt will be generated.
20.2
20.2.1
If Sleep mode is entered while the module is operating,
the module will be suspended in its current state until
clock execution resumes.
20.2.2
To continue full module operation in Idle mode, the
CSIDL bit must be cleared prior to entry into the mode.
If CSIDL = 1, the module will behave the same way as
it does in Sleep mode; pending interrupt events will be
passed on, even though the module clocks are not
available.
Operation in Power Save Modes
16
INTERRUPT OPERATION
SLEEP MODE
IDLE MODE
+ x
12
CRC Read Bus
D
BIT 12
p_clk
+ x
Q
5
2010 Microchip Technology Inc.
+ 1
CRC Write Bus
BIT 15
D
p_clk
Q
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