DSPIC30F3011-20I/ML Microchip Technology, DSPIC30F3011-20I/ML Datasheet - Page 121
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DSPIC30F3011-20I/ML
Manufacturer Part Number
DSPIC30F3011-20I/ML
Description
IC DSPIC MCU/DSP 24K 44QFN
Manufacturer
Microchip Technology
Series
dsPIC™ 30Fr
Datasheets
1.DSPIC30F3010-30ISO.pdf
(228 pages)
2.DSPIC30F3010-30ISO.pdf
(18 pages)
3.DSPIC30F3010-30ISO.pdf
(6 pages)
4.DSPIC30F3010-30ISO.pdf
(16 pages)
5.DSPIC30F3010-30ISO.pdf
(22 pages)
6.DSPIC30F3010-20ISP.pdf
(226 pages)
Specifications of DSPIC30F3011-20I/ML
Core Processor
dsPIC
Core Size
16-Bit
Speed
20 MIPS
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, Motor Control PWM, QEI, POR, PWM, WDT
Number Of I /o
30
Program Memory Size
24KB (8K x 24)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 5.5 V
Data Converters
A/D 9x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-QFN
Core Frequency
40MHz
Core Supply Voltage
5.5V
Embedded Interface Type
I2C, SPI, UART
No. Of I/o's
30
Flash Memory Size
24KB
Supply Voltage Range
2.5V To 5.5V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT44QFN2 - SOCKET TRAN ICE 44QFN/40DIPAC164322 - MODULE SOCKET MPLAB PM3 28/44QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
DSPIC30F301120IML
18.2
18.2.1
The UART module is enabled by setting the UARTEN
bit in the UxMODE register (where x = 1 or 2). Once
enabled, the UxTX and UxRX pins are configured as an
output and an input respectively, overriding the TRIS
and LATCH register bit settings for the corresponding
I/O port pins. The UxTX pin is at logic ‘1’ when no
transmission is taking place.
18.2.2
The UART module is disabled by clearing the
UARTEN bit in the UxMODE register. This is the
default state after any Reset. If the UART is disabled,
all I/O pins operate as port pins under the control of
the LATCH and TRIS bits of the corresponding port
pins.
Disabling the UART module resets the buffers to
empty states. Any data characters in the buffers are
lost and the baud rate counter is reset.
All error and status flags associated with the UART
module are reset when the module is disabled. The
URXDA, OERR, FERR, PERR, UTXEN, UTXBRK and
UTXBF bits are cleared, whereas RIDLE and TRMT
are set. Other control bits, including ADDEN,
URXISEL<1:0>, UTXISEL, as well as the UxMODE
and UxBRG registers, are not affected.
Clearing the UARTEN bit while the UART is active will
abort all pending transmissions and receptions and
reset the module as defined above. Re-enabling the
UART will restart the UART in the same configuration.
18.2.3
The alternate I/O function is enabled by setting the
ALTIO bit (U1MODE<10>). If ALTIO = 1, the UxATX and
UxARX pins (alternate transmit and alternate receive
pins, respectively) are used by the UART module
instead of the UxTX and UxRX pins. If ALTIO = 0, the
UxTX and UxRX pins are used by the UART module.
18.2.4
Control bits, PDSEL<1:0> in the UxMODE register, are
used to select the data length and parity used in the
transmission. The data length may either be 8 bits with
even, odd or no parity, or 9 bits with no parity.
The STSEL bit determines whether one or two Stop bits
will be used during data transmission.
The default (power-on) setting of the UART is 8 bits, no
parity, 1 Stop bit (typically represented as 8, N, 1).
© 2010 Microchip Technology Inc.
Enabling and Setting Up UART
ENABLING THE UART
DISABLING THE UART
ALTERNATE I/O
SETTING UP DATA, PARITY AND
STOP BIT SELECTIONS
18.3
18.3.1
The following steps must be performed in order to
transmit 8-bit data:
1.
2.
3.
4.
5.
18.3.2
The sequence of steps involved in the transmission of
9-bit data is similar to 8-bit transmission, except that a
16-bit data word (of which the upper 7 bits are always
clear) must be written to the UxTXREG register.
18.3.3
The transmit buffer is 9 bits wide and 4 characters
deep. Including the Transmit Shift register (UxTSR),
the user effectively has a 5-deep FIFO (First In First
Out) buffer. The UTXBF Status bit (UxSTA<9>)
indicates whether the transmit buffer is full.
If a user attempts to write to a full buffer, the new data
will not be accepted into the FIFO, and no data shift
will occur within the buffer. This enables recovery from
a buffer overrun condition.
The FIFO is reset during any device Reset, but is not
affected when the device enters or wakes up from a
power-saving mode.
dsPIC30F3010/3011
Set up the UART:
First, the data length, parity and number of Stop
bits must be selected. Then, the transmit and
receive interrupt enable and priority bits are set
up in the UxMODE and UxSTA registers. Also,
the appropriate baud rate value must be written
to the UxBRG register.
Enable the UART by setting the UARTEN bit
(UxMODE<15>).
Set the UTXEN bit (UxSTA<10>), thereby
enabling a transmission.
Write the byte to be transmitted to the lower byte
of UxTXREG. The value will be transferred to the
Transmit Shift register (UxTSR) immediately
and the serial bit stream will start shifting out
during the next rising edge of the baud clock.
Alternatively, the data byte may be written while
UTXEN = 0, following which, the user may set
UTXEN. This will cause the serial bit stream to
begin immediately because the baud clock will
start from a cleared state.
A transmit interrupt will be generated depending
on the value of the interrupt control bit, UTXISEL
(UxSTA<15>).
Transmitting Data
TRANSMITTING IN 8-BIT DATA
MODE
TRANSMITTING IN 9-BIT DATA
MODE
TRANSMIT BUFFER (U
DS70141F-page 121
X
TXB)