PIC18F25K22-I/SO Microchip Technology Inc., PIC18F25K22-I/SO Datasheet - Page 241
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PIC18F25K22-I/SO
Manufacturer Part Number
PIC18F25K22-I/SO
Description
32KB, Flash, 1536bytes-RAM, 8-bit Family, nanoWatt XLP, 28 SOIC .300in TUBE
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F45K22-IP.pdf
(496 pages)
Specifications of PIC18F25K22-I/SO
A/d Inputs
17-Channel, 10-Bit
Comparators
2
Cpu Speed
16 MIPS
Eeprom Memory
256 Bytes
Input Output
24
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SOIC
Programmable Memory
32K Bytes
Ram Size
1.5K Bytes
Speed
64 MHz
Temperature Range
–40 to 125 °C
Timers
3-8-bit, 4-16-bit
Voltage, Range
1.8-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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15.6.5 I
A Repeated Start condition occurs when the RSEN bit
of the SSPxCON2 register is programmed high and the
master state machine is no longer active. When the
RSEN bit is set, the SCLx pin is asserted low. When the
SCLx pin is sampled low, the Baud Rate Generator is
loaded and begins counting. The SDAx pin is released
(brought high) for one Baud Rate Generator count
(T
SDAx is sampled high, the SCLx pin will be deasserted
(brought high). When SCLx is sampled high, the Baud
Rate Generator is reloaded and begins counting. SDAx
and SCLx must be sampled high for one T
action is then followed by assertion of the SDAx pin
(SDAx = 0) for one T
asserted low. Following this, the RSEN bit of the
FIGURE 15-27:
2010 Microchip Technology Inc.
BRG
). When the Baud Rate Generator times out, if
START CONDITION TIMING
2
C MASTER MODE REPEATED
BRG
REPEAT START CONDITION WAVEFORM
SDAx
SCLx
while SCLx is high. SCLx is
Write to SSPxCON2
occurs here
SDAx = 1,
SCLx (no change)
BRG
. This
Preliminary
T
BRG
SDAx = 1,
SCLx = 1
T
BRG
Repeated Start
SSPxCON2 register will be automatically cleared and
the Baud Rate Generator will not be reloaded, leaving
the SDAx pin held low. As soon as a Start condition is
detected on the SDAx and SCLx pins, the S bit of the
SSPxSTAT register will be set. The SSPxIF bit will not
be set until the Baud Rate Generator has timed out.
Sr
Note 1: If RSEN is programmed while any other
PIC18(L)F2X/4XK22
T
BRG
2: A bus collision during the Repeated Start
S bit set by hardware
At completion of Start bit,
hardware clears RSEN bit
Write to SSPxBUF occurs here
event is in progress, it will not take effect.
condition occurs if:
and sets SSPxIF
• SDAx is sampled low when SCLx
• SCLx goes low before SDAx is
T
BRG
goes from low-to-high.
asserted low. This may indicate
that another master is attempting to
transmit a data ‘1’.
1st bit
T
BRG
DS41412D-page 241
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