PIC18F25K22-I/SO Microchip Technology Inc., PIC18F25K22-I/SO Datasheet - Page 282
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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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PIC18(L)F2X/4XK22
16.3.4
The EUSART module has the capability of sending the
special Break character sequences that are required by
the LIN bus standard. A Break character consists of a
Start bit, followed by 12 ‘0’ bits and a Stop bit.
To send a Break character, set the SENDB and TXEN
bits of the TXSTAx register. The Break character trans-
mission is then initiated by a write to the TXREGx. The
value of data written to TXREGx will be ignored and all
‘0’s will be transmitted.
The SENDB bit is automatically reset by hardware after
the corresponding Stop bit is sent. This allows the user
to preload the transmit FIFO with the next transmit byte
following the Break character (typically, the Sync
character in the LIN specification).
The TRMT bit of the TXSTAx register indicates when the
transmit operation is active or Idle, just as it does during
normal transmission. See
the Break character sequence.
16.3.4.1
The following sequence will start a message frame
header made up of a Break, followed by an auto-baud
Sync byte. This sequence is typical of a LIN bus
master.
1.
2.
3.
4.
5.
FIGURE 16-9:
DS41412D-page 282
Reg. Empty Flag)
Write to TXREGx
(Transmit Shift
Configure the EUSART for the desired mode.
Set the TXEN and SENDB bits to enable the
Break sequence.
Load the TXREGx with a dummy character to
initiate transmission (the value is ignored).
Write ‘55h’ to TXREGx to load the Sync charac-
ter into the transmit FIFO buffer.
After the Break has been sent, the SENDB bit is
reset by hardware and the Sync character is
then transmitted.
TXx/CKx (pin)
interrupt Flag)
(send Break
BRG Output
(Shift Clock)
control bit)
(Transmit
TRMT bit
TXxIF bit
SENDB
BREAK CHARACTER SEQUENCE
Break and Sync Transmit Sequence
SEND BREAK CHARACTER SEQUENCE
Dummy Write
Figure 16-9
SENDB Sampled Here
Start bit
for the timing of
bit 0
Preliminary
bit 1
Break
When the TXREGx becomes empty, as indicated by
the TXxIF, the next data byte can be written to
TXREGx.
16.3.5
The Enhanced EUSART module can receive a Break
character in two ways.
The first method to detect a Break character uses the
FERR bit of the RCSTAx register and the Received
data as indicated by RCREGx. The Baud Rate
Generator is assumed to have been initialized to the
expected baud rate.
A Break character has been received when;
• RCxIF bit is set
• FERR bit is set
• RCREGx = 00h
The second method uses the Auto-Wake-up feature
described in
Break”. By enabling this feature, the EUSART will
sample the next two transitions on RXx/DTx, cause an
RCxIF interrupt, and receive the next data byte fol-
lowed by another interrupt.
Note that following a Break character, the user will
typically want to enable the Auto-Baud Detect feature.
For both methods, the user can set the ABDEN bit of
the BAUDCONx register before placing the EUSART in
Sleep mode.
RECEIVING A BREAK CHARACTER
Section 16.3.3 “Auto-Wake-up on
bit 11
Auto Cleared
2010 Microchip Technology Inc.
Stop bit
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