The I2
參數(shù)資料
型號(hào): DSPIC30F5016-30I/PT
廠商: Microchip Technology
文件頁數(shù): 17/129頁
文件大小: 0K
描述: IC DSPIC MCU/DSP 66K 80TQFP
產(chǎn)品培訓(xùn)模塊: dsPIC30F Quadrature Encoder Interface
Serial Communications using dsPIC30F CAN
Serial Communications using dsPIC30F I2C
Serial Communications using dsPIC30F SPI
Serial Communications using dsPIC30F UART
dsPIC30F 12 bit ADC - Part 2
dsPIC30F Addressing Modes - Part 1
dsPIC30F Architecture - Part 1
dsPIC30F DSP Engine & ALU
Asynchronous Stimulus
dsPIC30F Addressing Modes - Part 2
dsPIC30F Architecture - Part 2
dsPIC30F 12-bit ADC Part 1
標(biāo)準(zhǔn)包裝: 119
系列: dsPIC™ 30F
核心處理器: dsPIC
芯體尺寸: 16-位
速度: 30 MIP
連通性: CAN,I²C,SPI,UART/USART
外圍設(shè)備: 高級(jí)欠壓探測/復(fù)位,電機(jī)控制 PWM,QEI,POR,PWM,WDT
輸入/輸出數(shù): 68
程序存儲(chǔ)器容量: 66KB(22K x 24)
程序存儲(chǔ)器類型: 閃存
EEPROM 大小: 1K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 80-TQFP
包裝: 托盤
產(chǎn)品目錄頁面: 651 (CN2011-ZH PDF)
配用: AC164320-ND - MODULE SKT MPLAB PM3 80TQFP
AC30F007-ND - MODULE SKT FOR DSPIC30F 80TQFP
DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE
其它名稱: DSPIC30F501630IPT
2008 Microchip Technology Inc.
DS70149D-page 113
dsPIC30F5015/5016
17.7
Interrupts
The I2C module generates two interrupt flags, MI2CIF
(I2C Master Interrupt Flag) and SI2CIF (I2C Slave
Interrupt Flag). The MI2CIF interrupt flag is activated
on completion of a master message event. The SI2CIF
interrupt flag is activated on detection of a message
directed to the slave.
17.8
Slope Control
The I2C standard requires slope control on the SDA
and SCL signals for Fast Mode (400 kHz). The control
bit, DISSLW, enables the user to disable slew rate
control, if desired. It is necessary to disable the slew
rate control for 1 MHz mode.
17.9
IPMI Support
The control bit, IPMIEN, enables the module to support
Intelligent Peripheral Management Interface (IPMI).
When this bit is set, the module accepts and acts upon
all addresses.
17.10 General Call Address Support
The general call address can address all devices.
When this address is used, all devices should, in
theory, respond with an Acknowledgement.
The general call address is one of eight addresses
reserved for specific purposes by the I2C protocol. It
consists of all ‘0’s with R_W = 0.
The general call address is recognized when the General
Call Enable (GCEN) bit is set (I2CCON<7> = 1).
Following a Start bit detection, 8 bits are shifted into
I2CRSR and the address is compared with I2CADD, and
is also compared with the general call address which is
fixed in hardware.
If a general call address match occurs, the I2CRSR is
transferred to the I2CRCV after the eighth clock, the
RBF flag is set, and on the falling edge of the ninth bit
(ACK bit), the master event interrupt flag (MI2CIF) is
set.
When the interrupt is serviced, the source for the inter-
rupt can be checked by reading the contents of the
I2CRCV to determine if the address was device
specific, or a general call address.
17.11 I2C Master Support
As a Master device, six operations are supported.
Assert a Start condition on SDA and SCL.
Assert a Restart condition on SDA and SCL.
Write to the I2CTRN register initiating
transmission of data/address.
Generate a Stop condition on SDA and SCL.
Configure the I2C port to receive data.
Generate an ACK condition at the end of a
received byte of data.
17.12 I2C Master Operation
The master device generates all of the serial clock
pulses and the Start and Stop conditions. A transfer is
ended with a Stop condition or with a Repeated Start
condition. Since the Repeated Start condition is also
the beginning of the next serial transfer, the I2C bus will
not be released.
In Master Transmitter mode, serial data is output
through SDA, while SCL outputs the serial clock. The
first byte transmitted contains the slave address of the
receiving device (7 bits) and the data direction bit. In
this case, the data direction bit (R_W) is logic ‘0’. Serial
data is transmitted 8 bits at a time. After each byte is
transmitted, an ACK bit is received. Start and Stop
conditions are output to indicate the beginning and the
end of a serial transfer.
In Master Receive mode, the first byte transmitted
contains the slave address of the transmitting device
(7 bits) and the data direction bit. In this case, the data
direction bit (R_W) is logic ‘1’. Thus, the first byte
transmitted is a 7-bit slave address, followed by a ‘1’ to
indicate receive bit. Serial data is received via SDA,
while SCL outputs the serial clock. Serial data is
received 8 bits at a time. After each byte is received, an
ACK bit is transmitted. Start and Stop conditions
indicate the beginning and end of transmission.
17.12.1
I2C MASTER TRANSMISSION
Transmission of a data byte, a 7-bit address, or the sec-
ond half of a 10-bit address is accomplished by simply
writing a value to I2CTRN register. The user should
only write to I2CTRN when the module is in a WAIT
state. This action will set the buffer full flag (TBF) and
allow the Baud Rate Generator to begin counting and
start the next transmission. Each bit of address/data
will be shifted out onto the SDA pin after the falling
edge of SCL is asserted. The Transmit Status Flag,
TRSTAT (I2CSTAT<14>), indicates that a master
transmit is in progress.
17.12.2
I2C MASTER RECEPTION
Master mode reception is enabled by programming the
receive enable (RCEN) bit (I2CCON<3>). The I2C
module must be Idle before the RCEN bit is set,
otherwise 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 in
to the I2CRSR on the rising edge of each clock.
17.12.3
BAUD RATE GENERATOR
In I2C Master mode, the reload value for the BRG is
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.
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