SSP I2C Operation <" />
參數(shù)資料
型號(hào)： KSZ8851-16MLL TR
廠商： Micrel Inc
文件頁(yè)數(shù)： 64/84頁(yè)
文件大?。?/td> 0K
描述： IC MAC CTLR 1PORT W/BUS 48LQFP
產(chǎn)品培訓(xùn)模塊： KSZ8851 10/100 Embedded Controllers
標(biāo)準(zhǔn)包裝： 1,000
控制器類型： 以太網(wǎng)控制器，MAC/PHY
接口： 總線
電源電壓： 1.8V，2.5V，3.3V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 帶卷 (TR)
2002 Microchip Technology Inc.
DS30325B-page 65
PIC16F7X
9.3
SSP I2C Operation
The SSP module in I2C mode, fully implements all slave
functions, except general call support, and provides
interrupts on START and STOP bits in hardware to facil-
itate firmware implementations of the master functions.
The SSP module implements the standard mode speci-
fications as well as 7-bit and 10-bit addressing.
Two pins are used for data transfer. These are the RC3/
SCK/SCL pin, which is the clock (SCL), and the RC4/
SDI/SDA pin, which is the data (SDA). The user must
configure these pins as inputs or outputs through the
TRISC<4:3> bits.
The SSP module functions are enabled by setting SSP
enable bit SSPEN (SSPCON<5>).
FIGURE 9-5:
SSP BLOCK DIAGRAM
(I2C MODE)
The SSP module has five registers for I2C operation.
These are the:
SSP Control Register (SSPCON)
SSP Status Register (SSPSTAT)
Serial Receive/Transmit Buffer (SSPBUF)
SSP Shift Register (SSPSR) - Not directly accessible
SSP Address Register (SSPADD)
The SSPCON register allows control of the I2C opera-
tion. Four mode selection bits (SSPCON<3:0>) allow
one of the following I2C modes to be selected:
I2C Slave mode (7-bit address)
I2C Slave mode (10-bit address)
I2C Slave mode (7-bit address), with START and
STOP bit interrupts enabled to support Firmware
Master mode
I2C Slave mode (10-bit address), with START and
STOP bit interrupts enabled to support Firmware
Master mode
I2C START and STOP bit interrupts enabled to
support Firmware Master mode, Slave is IDLE
Selection of any I2C mode with the SSPEN bit set,
forces the SCL and SDA pins to be open drain, pro-
vided these pins are programmed to inputs by setting
the appropriate TRISC bits. Pull-up resistors must be
provided externally to the SCL and SDA pins for proper
operation of the I2C module.
Additional information on SSP I2C operation can be
found in the PICmicro Mid-Range MCU Family Ref-
erence Manual (DS33023A).
9.3.1
SLAVE MODE
In Slave mode, the SCL and SDA pins must be config-
ured as inputs (TRISC<4:3> set). The SSP module will
override the input state with the output data when
required (slave-transmitter).
When an address is matched, or the data transfer after
an address match is received, the hardware automati-
cally will generate the Acknowledge (ACK) pulse, and
then load the SSPBUF register with the received value
currently in the SSPSR register.
There are certain conditions that will cause the SSP
module not to give this ACK pulse. They include (either
or both):
a)
The buffer full bit BF (SSPSTAT<0>) was set
before the transfer was received.
b)
The overflow bit SSPOV (SSPCON<6>) was set
before the transfer was received.
In this case, the SSPSR register value is not loaded
into the SSPBUF, but bit SSPIF (PIR1<3>) is set.
Table 9-2 shows what happens when a data transfer
byte is received, given the status of bits BF and
SSPOV. The shaded cells show the condition where
user software did not properly clear the overflow condi-
tion. Flag bit BF is cleared by reading the SSPBUF reg-
ister, while bit SSPOV is cleared through software.
The SCL clock input must have a minimum high and
low for proper operation. The high and low times of the
I2C specification, as well as the requirements of the
SSP module, are shown in timing parameter #100 and
parameter #101.
Read
Write
SSPSR reg
Match Detect
SSPADD reg
START and
STOP bit Detect
SSPBUF reg
Internal
Data Bus
Addr Match
Set, RESET
S, P bits
(SSPSTAT reg)
RC3/SCK/SCL
RC4/
Shift
Clock
MSb
SDI/
LSb
SDA
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