I2C Module Add" />
參數(shù)資料
型號(hào)： DSPIC30F6010A-30I/PF
廠商： Microchip Technology
文件頁(yè)數(shù)： 17/234頁(yè)
文件大?。?/td> 0K
描述： IC DSPIC MCU/DSP 144K 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
dsPIC30F Interrupts
dsPIC30F Motor Control PWM
dsPIC Timers
Asynchronous Stimulus
dsPIC30F Addressing Modes - Part 2
dsPIC30F Architecture - Part 2
dsPIC30F 12-bit ADC Part 1
標(biāo)準(zhǔn)包裝： 90
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(cè)/復(fù)位，LVD，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： 144KB（48K x 24）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 4K x 8
RAM 容量： 8K 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(yè)面： 651 (CN2011-ZH PDF)
配用： DM300019-ND - BOARD DEMO DSPICDEM 80L STARTER
AC164314-ND - MODULE SKT FOR PM3 80PF
DM300020-ND - BOARD DEV DSPICDEM MC1 MOTORCTRL
DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE
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2011 Microchip Technology Inc.
DS70150E-page 113
dsPIC30F6010A/6015
17.2
I2C Module Addresses
The I2CADD register contains the Slave mode
addresses. The register is a 10-bit register.
If the A10M bit (I2CCON<10>) is ‘0’, the address is
interpreted by the module as a 7-bit address. When an
address is received, it is compared to the 7 Least
Significant bits of the I2CADD register.
If the A10M bit is ‘1’, the address is assumed to be a
10-bit address. When an address is received, it will be
compared with the binary value ‘1 1 1 1 0 A9 A8’
(where A9, A8 are two Most Significant bits of
I2CADD). If that value matches, the next address will
be compared with the Least Significant 8 bits of
I2CADD, as specified in the 10-bit addressing protocol.
TABLE 17-1:
7-BIT I2C SLAVE
ADDRESSES SUPPORTED BY
dsPIC30F
17.3
I2C 7-bit Slave Mode Operation
Once enabled (I2CEN = 1), the slave module will wait
for a Start bit to occur (i.e., the I2C module is ‘Idle’).
Following the detection of a Start bit, 8 bits are shifted
into I2CRSR and the address is compared against
I2CADD. In 7-bit mode (A10M = 0), bits I2CADD<6:0>
are compared against I2CRSR<7:1> and I2CRSR<0>
is the R_W bit. All incoming bits are sampled on the
rising edge of SCL.
If an address match occurs, an Acknowledgement will
be sent, and the Slave Event Interrupt Flag (SI2CIF) is
set on the falling edge of the ninth (ACK) bit. The
address match does not affect the contents of the
I2CRCV buffer or the RBF bit.
17.3.1
SLAVE TRANSMISSION
If the R_W bit received is a ‘1’, then the serial port will
go into Transmit mode. It will send ACK on the ninth bit
and then hold SCL to ‘0’ until the CPU responds by writ-
ing to I2CTRN. SCL is released by setting the SCLREL
bit, and 8 bits of data are shifted out. Data bits are
shifted out on the falling edge of SCL, such that SDA is
valid during SCL high (see timing diagram). The inter-
rupt pulse is sent on the falling edge of the ninth clock
pulse, regardless of the status of the ACK received
from the master.
17.3.2
SLAVE RECEPTION
If the R_W bit received is a ‘0’ during an address
match, then Receive mode is initiated. Incoming bits
are sampled on the rising edge of SCL. After 8 bits are
received, if I2CRCV is not full or I2COV is not set,
I2CRSR is transferred to I2CRCV. ACK is sent on the
ninth clock.
If the RBF flag is set, indicating that I2CRCV is still
holding data from a previous operation (RBF = 1), then
ACK is not sent; however, the interrupt pulse is gener-
ated. In the case of an overflow, the contents of the
I2CRSR are not loaded into the I2CRCV.
17.4
I2C 10-bit Slave Mode Operation
In 10-bit mode, the basic receive and transmit opera-
tions are the same as in the 7-bit mode. However, the
criteria for address match is more complex.
The I2C specification dictates that a slave must be
addressed for a write operation, with two address bytes
following a Start bit.
The A10M bit is a control bit that signifies that the
address in I2CADD is a 10-bit address rather than a
7-bit address. The address detection protocol for the
first byte of a message address is identical for 7-bit
and 10-bit messages, but the bits being compared are
different.
I2CADD holds the entire 10-bit address. Upon receiv-
ing an address following a Start bit, I2CRSR <7:3> is
compared against a literal ‘11110’ (the default 10-bit
address) and I2CRSR<2:1> are compared against
I2CADD<9:8>. If a match occurs and if R_W = 0, the
interrupt pulse is sent. The ADD10 bit will be cleared to
indicate a partial address match. If a match fails or
R_W = 1, the ADD10 bit is cleared and the module
returns to the Idle state.
The low byte of the address is then received and com-
pared with I2CADD<7:0>. If an address match occurs,
the interrupt pulse is generated and the ADD10 bit is
set, indicating a complete 10-bit address match. If an
address match did not occur, the ADD10 bit is cleared
and the module returns to the Idle state.
Address
Description
0x00
General call address or start byte
0x01-0x03
Reserved
0x04-0x07
HS-mode master codes
0x04-0x77
Valid 7-bit addresses
0x78-0x7b
Valid 10-bit addresses (lower 7 bits)
0x7c-0x7f
Reserved
Note:
The I2CRCV will be loaded if the I2COV
bit = 1 and the RBF flag = 0. In this case,
a read of the I2CRCV was performed, but
the user did not clear the state of the
I2COV
bit
before
the
next
receive
occurred. The Acknowledgement is not
sent (ACK = 1) and the I2CRCV is
updated.
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