PIC16LF1906-E/SS Microchip Technology, PIC16LF1906-E/SS Datasheet - Page 175
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PIC16LF1906-E/SS
Manufacturer Part Number
PIC16LF1906-E/SS
Description
14KB Flash, 512B RAM, LCD, 11x10b ADC, EUSART, NanoWatt XLP 28 SSOP .209in TUBE
Manufacturer
Microchip Technology
Series
PIC® XLP™ 16Fr
Datasheet
1.PIC16LF1904-EMV.pdf
(288 pages)
Specifications of PIC16LF1906-E/SS
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
LIN, UART/USART
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
25
Program Memory Size
14KB (8K x 14)
Program Memory Type
FLASH
Eeprom Size
-
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
28-SSOP (0.209", 5.30mm Width)
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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18.3.4
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 TXSTA register. The Break character trans-
mission is then initiated by a write to the TXREG. The
value of data written to TXREG 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 TXSTA register indicates when the
transmit operation is active or Idle, just as it does during
normal transmission. See
the Break character sequence.
18.3.4.1
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 18-9:
2011 Microchip Technology Inc.
Reg. Empty Flag)
Write to TXREG
(Transmit Shift
Configure the EUSART for the desired mode.
Set the TXEN and SENDB bits to enable the
Break sequence.
Load the TXREG with a dummy character to
initiate transmission (the value is ignored).
Write ‘55h’ to TXREG to load the Sync character
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.
interrupt Flag)
(send Break
BRG Output
(Shift Clock)
TX/CK (pin)
control bit)
(Transmit
TRMT bit
TXIF bit
SENDB
BREAK CHARACTER SEQUENCE
Break and Sync Transmit Sequence
SEND BREAK CHARACTER SEQUENCE
Dummy Write
Figure 18-9
SENDB Sampled Here
Start bit
for the timing of
bit 0
Preliminary
bit 1
Break
When the TXREG becomes empty, as indicated by the
TXIF, the next data byte can be written to TXREG.
18.3.5
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 RCSTA register and the Received data
as indicated by RCREG. The Baud Rate Generator is
assumed to have been initialized to the expected baud
rate.
A Break character has been received when;
• RCIF bit is set
• FERR bit is set
• RCREG = 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 RX/DT, cause an
RCIF interrupt, and receive the next data byte followed
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 BAUDCON register before placing the EUSART in
Sleep mode.
PIC16LF1904/6/7
RECEIVING A BREAK CHARACTER
Section 18.3.3 “Auto-Wake-up on
bit 11
Auto Cleared
Stop bit
DS41569A-page 175
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