PIC16LF1454 Datasheet, PDF (275/418 Pages) Microchip Technology – 14/20-Pin Flash, 8-Bit USB Microcontrollers with XLP Technology

PIC16(L)F1454/5/9
23.4.1 AUTO-BAUD DETECT
The EUSART module supports automatic detection
and calibration of the baud rate.
In the Auto-Baud Detect (ABD) mode, the clock to the
BRG is reversed. Rather than the BRG clocking the
incoming RX signal, the RX signal is timing the BRG.
The Baud Rate Generator is used to time the period of
a received 55h (ASCII “U”) which is the Sync character
for the LIN bus. The unique feature of this character is
that it has five rising edges including the Stop bit edge.
Setting the ABDEN bit of the BAUDCON register starts
the auto-baud calibration sequence (Figure 23-6).
While the ABD sequence takes place, the EUSART
state machine is held in Idle. On the first rising edge of
the receive line, after the Start bit, the SPBRG begins
counting up using the BRG counter clock as shown in
Table 23-6. The fifth rising edge will occur on the RX pin
at the end of the eighth bit period. At that time, an
accumulated value totaling the proper BRG period is
left in the SPBRGH, SPBRGL register pair, the ABDEN
bit is automatically cleared and the RCIF interrupt flag
is set. The value in the RCREG needs to be read to
clear the RCIF interrupt. RCREG content should be
discarded. When calibrating for modes that do not use
the SPBRGH register the user can verify that the
SPBRGL register did not overflow by checking for 00h
in the SPBRGH register.
The BRG auto-baud clock is determined by the BRG16
and BRGH bits as shown in Table 23-6. During ABD,
both the SPBRGH and SPBRGL registers are used as
a 16-bit counter, independent of the BRG16 bit setting.
While calibrating the baud rate period, the SPBRGH
and SPBRGL registers are clocked at 1/8th the BRG
base clock rate. The resulting byte measurement is the
average bit time when clocked at full speed.
Note 1: If the WUE bit is set with the ABDEN bit,
auto-baud detection will occur on the byte
following the Break character (see
Section 23.4.3 “Auto-Wake-up on
Break”).
2: It is up to the user to determine that the
incoming character baud rate is within the
range of the selected BRG clock source.
Some combinations of oscillator frequency
and EUSART baud rates are not possible.
3: During the auto-baud process, the
auto-baud counter starts counting at one.
Upon completion of the auto-baud
sequence, to achieve maximum accuracy,
subtract one from the SPBRGH:SPBRGL
register pair.
TABLE 23-6: BRG COUNTER CLOCK RATES
BRG16 BRGH
BRG Base
Clock
BRG ABD
Clock
0
0
1
1
Note:
0
FOSC/64
FOSC/512
1
FOSC/16
FOSC/128
0
FOSC/16
FOSC/128
1
FOSC/4
FOSC/32
During the ABD sequence, SPBRGL and
SPBRGH registers are both used as a 16-bit
counter, independent of BRG16 setting.
FIGURE 23-6:
AUTOMATIC BAUD RATE CALIBRATION
BRG Value
RX pin
XXXXh
0000h
Start
Edge #1
bit 0 ^{bit 1}
Edge #2
bit 2 ^{bit 3}
Edge #3
bit 4 ^{bit 5}
Edge #4
bit 6 ^{bit 7}
001Ch
Edge #5
Stop bit
BRG Clock
Set by User
ABDEN bit
RCIDL
RCIF bit
(Interrupt)
Read
RCREG
SPBRGL
XXh
SPBRGH
XXh
Note 1: The ABD sequence requires the EUSART module to be configured in Asynchronous mode.
Auto Cleared
1Ch
00h
 2012 Microchip Technology Inc.
Preliminary
DS41639A-page 275