DSPIC33FJ64MC506-I/PT Microchip Technology Inc., DSPIC33FJ64MC506-I/PT Datasheet - Page 201
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DSPIC33FJ64MC506-I/PT
Manufacturer Part Number
DSPIC33FJ64MC506-I/PT
Description
DSP, 16-Bit, 64KB Flash, 8KB RAM, 53 I/O, TQFP-64
Manufacturer
Microchip Technology Inc.
Type
DSPr
Datasheet
1.DSPIC33FJ64MC506-IPT.pdf
(370 pages)
Specifications of DSPIC33FJ64MC506-I/PT
A/d Inputs
16-Channels, 12-Bit
Comparators
8
Cpu Speed
40 MIPS
Eeprom Memory
0 Bytes
Input Output
53
Interface
CAN, I2C, SPI, UART/USART
Ios
53
Memory Type
Flash
Number Of Bits
16
Package Type
64-pin TQFP
Programmable Memory
64K Bytes
Ram Size
8K Bytes
Timers
9-16-bit, 4-32-bit
Voltage, Range
3-3.6
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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16.4
The digital noise filter section is responsible for
rejecting noise on the incoming capture or quadrature
signals. Schmitt Trigger inputs and a 3-clock cycle
delay filter combine to reject low-level noise and large,
short duration noise spikes that typically occur in noise
prone applications, such as a motor system.
The filter ensures that the filtered output signal is not
permitted to change until a stable value has been
registered for three consecutive clock cycles.
For the QEA, QEB and INDX pins, the clock divide
frequency for the digital filter is programmed by bits,
QECK<2:0> (DFLTCON<6:4>), and are derived from
the base instruction cycle, T
To enable the filter output for channels QEA, QEB and
INDX, the QEOUT bit must be ‘1’. The filter network for
all channels is disabled on POR.
16.5
When the QEI module is not configured for the QEI
mode, QEIM<2:0> = 001, the module can be con-
figured as a simple 16-bit timer/counter. The setup and
control of the auxiliary timer is accomplished through
the QEICON SFR register. This timer functions identi-
cally to Timer1. The QEA pin is used as the timer clock
input.
When configured as a timer, the POSCNT register
serves as the Timer Count register and the MAXCNT
register serves as the Period register. When a Timer/
Period register match occur, the QEI interrupt flag will
be asserted.
The only exception between the general purpose
timers and this timer is the added feature of external
up/down input select. When the UPDN pin is asserted
high, the timer will increment up. When the UPDN pin
is asserted low, the timer will be decremented.
The UPDN control/status bit (QEICON<11>) can be
used to select the count direction state of the Timer
register. When UPDN = 1, the timer will count up. When
UPDN = 0, the timer will count down.
© 2007 Microchip Technology Inc.
Note:
Programmable Digital Noise
Filters
Alternate 16-bit Timer/Counter
Changing the operational mode (i.e., from
QEI to timer or vice versa) will not affect the
Timer/Position Count register contents.
CY
.
Preliminary
In addition, control bit UPDN_SRC, (QEICON<0>),
determines whether the timer count direction state is
based on the logic state written into the UPDN control/
status bit (QEICON<11>) or the QEB pin state. When
UPDN_SRC = 1, the timer count direction is controlled
from the QEB pin. Likewise, when UPDN_SRC = 0, the
timer count direction is controlled by the UPDN bit.
16.6
16.6.1
The QEI module will be halted during the CPU Sleep
mode.
16.6.2
During CPU Sleep mode, the timer will not operate
because the internal clocks are disabled.
16.7
Since the QEI module can function as a Quadrature
Encoder Interface, or as a 16-bit timer, the following
section describes operation of the module in both
modes.
16.7.1
When the CPU is placed in the Idle mode, the QEI
module will operate if QEISIDL (QEICON<13>) = 0.
This bit defaults to a logic ‘0’ upon executing POR. For
halting the QEI module during the CPU Idle mode,
QEISIDL should be set to ‘1’.
Note:
QEI Module Operation During CPU
Sleep Mode
QEI Module Operation During CPU
Idle Mode
This timer does not support the External
Asynchronous Counter mode of operation.
If using an external clock source, the clock
will automatically be synchronized to the
internal instruction cycle.
QEI OPERATION DURING CPU
SLEEP MODE
TIMER OPERATION DURING CPU
SLEEP MODE
QEI OPERATION DURING CPU
IDLE MODE
dsPIC33F
DS70165E-page 199
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