参数资料
型号: PIC16C74B-04I/P
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP40
封装: 0.600 INCH, PLASTIC, MO-011, DIP-40
文件页数: 142/184页
文件大小: 2181K
代理商: PIC16C74B-04I/P
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PIC16C63A/65B/73B/74B
DS30605C-page 60
2000 Microchip Technology Inc.
10.3
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
facilitate firmware implementation of the master func-
tions. The SSP module implements the standard mode
specifications as well as 7-bit and 10-bit addressing.
Two pins are used for data transfer, 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. External pull-up resistors for the SCL
and SDA pins must be provided in the application cir-
cuit for proper operation of the I2C module.
The SSP module functions are enabled by setting SSP
enable bit SSPEN (SSPCON<5>).
FIGURE 10-5:
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.
Additional information on SSP I2C operation can be
found in the PICmicro Mid-Range MCU Family Ref-
erence Manual (DS33023).
10.3.1
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 generates the acknowledge (ACK) pulse, and
then loads 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 10-2 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
register while bit SSPOV is cleared through software.
The SCL clock input must have minimum high and low
times for proper operation. The high and low times of
the I2C specification, as well as the requirement of the
SSP module, is shown in timing parameter #100 and
parameter #101.
Read
Write
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/SDI/
Shift
Clock
MSb
LSb
SDA
SSPSR reg
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