DSPIC30F3010-20I/SP Microchip Technology, DSPIC30F3010-20I/SP Datasheet - Page 116

• Manufacturer Part Number: DSPIC30F3010-20I/SP
• Description: IC DSPIC MCU/DSP 24K 28DIP
• Manufacturer: Microchip Technology
• Series: dsPIC™ 30Fr

Specifications of DSPIC30F3010-20I/SP

• 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: 20
• 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 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Core Frequency: 40MHz
• Core Supply Voltage: 5.5V
• Embedded Interface Type: I2C, SPI, UART
• No. Of I/o's: 20
• Flash Memory Size: 24KB
• Supply Voltage Range: 2.5V To 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DSPIC30F301020ISP

dsPIC30F3010/3011
17.12.2
Master mode reception is enabled by programming the
Receive Enable (RCEN) bit (I2CCON<3>). The I
module must be Idle before the RCEN bit is set; other-
wise, the RCEN bit will be disregarded. The Baud Rate
Generator begins counting, and on each rollover, the
state of the SCL pin toggles, and data is shifted into the
I2CRSR on the rising edge of each clock.
17.12.3
In I
located in the I2CBRG register. When the BRG is
loaded with this value, the BRG counts down to ‘0’ and
stops until another reload has taken place. If clock
arbitration is taking place, for instance, the BRG is
reloaded when the SCL pin is sampled high.
As per the I
400 kHz. However, the user can specify any baud rate
up to 1 MHz. I2CBRG values of ‘0’ or ‘1’ are illegal.
EQUATION 17-1:
17.12.4
Clock arbitration occurs when the master deasserts the
SCL pin (SCL allowed to float high) during any receive,
transmit or Restart/Stop condition. When the SCL pin is
allowed to float high, the Baud Rate Generator is
suspended from counting until the SCL pin is actually
sampled high. When the SCL pin is sampled high, the
Baud Rate Generator is reloaded with the contents of
I2CBRG and begins counting. This ensures that the
SCL high time will always be at least one BRG rollover
count in the event that the clock is held low by an
external device.
17.12.5
Multi-master operation support is achieved by bus
arbitration. When the master outputs address/data bits
onto the SDA pin, arbitration takes place when the
master outputs a ‘1’ on SDA, by letting SDA float high
while another master asserts a ‘0’. When the SCL pin
floats high, data should be stable. If the expected data
on SDA is a ‘1’ and the data sampled on the SDA
pin = 0, then a bus collision has taken place. The
master will set the MI2CIF pulse and reset the master
portion of the I
DS70141F-page 116
2
C Master mode, the reload value for the BRG is
I2CBRG =
I
BAUD RATE GENERATOR (BRG)
CLOCK ARBITRATION
MULTI-MASTER COMMUNICATION,
BUS COLLISION AND BUS
ARBITRATION
2
2
C MASTER RECEPTION
C standard, F
2
C port to its Idle state.
(
F
F
SCL
CY
I2CBRG VALUE
–
SCL
1,111,111
may be 100 kHz or
F
CY
)
– 1
2
C
If a transmit was in progress when the bus collision
occurred, the transmission is halted, the TBF flag is
cleared, the SDA and SCL lines are deasserted and a
value can now be written to I2CTRN. When the user
services the I
Routine, if the I
user can resume communication by asserting a Start
condition.
If a Start, Restart, Stop or Acknowledge condition was
in progress when the bus collision occurred, the condi-
tion is aborted, the SDA and SCL lines are deasserted
and the respective control bits in the I2CCON register
are cleared to ‘0’. When the user services the bus
collision Interrupt Service Routine, and if the I
free, the user can resume communication by asserting
a Start condition.
The Master will continue to monitor the SDA and SCL
pins, and if a Stop condition occurs, the MI2CIF bit will
be set.
A write to the I2CTRN will start the transmission of data
at the first data bit, regardless of where the transmitter
left off when bus collision occurred.
In a Multi-Master environment, the interrupt generation
on the detection of Start and Stop conditions allows the
determination of when the bus is free. Control of the I
bus can be taken when the P bit is set in the I2CSTAT
register, or the bus is Idle and the S and P bits are
cleared.
17.13 I
17.13.1
When the device enters Sleep mode, all clock sources
to the module are shut down and stay at logic ‘0’. If
Sleep occurs in the middle of a transmission, and the
state machine is partially into a transmission as the
clocks stop, then the transmission is aborted. Similarly,
if Sleep occurs in the middle of a reception, then the
reception is aborted.
17.13.2
For the I
stop on Idle or continue on Idle. If I2CSIDL = 0, the
module will continue operation on assertion of the Idle
mode. If I2CSIDL = 1, the module will stop on Idle.
2
Sleep and Idle Modes
2
C, the I2CSIDL bit selects if the module will
C Module Operation During CPU
I
SLEEP MODE
I
MODE
2
2
C OPERATION DURING CPU
C OPERATION DURING CPU IDLE
2
2
C bus is free (i.e., the P bit is set), the
C master event Interrupt Service
© 2010 Microchip Technology Inc.
2
C bus is
2
C