PIC18F25J50 MICROCHIP [Microchip Technology], PIC18F25J50 Datasheet - Page 343

• Manufacturer Part Number: PIC18F25J50
• Description: 28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

20.3.2
Once Synchronous mode is selected, reception is
enabled by setting either the Single Receive Enable bit,
SREN (RCSTAx<5>) or the Continuous Receive
Enable bit, CREN (RCSTAx<4>). Data is sampled on
the RXx pin on the falling edge of the clock.
If enable bit, SREN, is set, only a single word is
received. If enable bit, CREN, is set, the reception is
continuous until CREN is cleared. If both bits are set,
then CREN takes precedence.
To set up a Synchronous Master Reception:
1.
2.
FIGURE 20-13:
 2011 Microchip Technology Inc.
RC6/TX1/CK1/RP17
RC6/TX1/CK1/RP17
Note: Timing diagram demonstrates Sync Master mode with bit, SREN =
Initialize the SPBRGHx:SPBRGx registers for
the appropriate baud rate. Set or clear the
BRG16 bit, as required, to achieve the desired
baud rate.
Enable the synchronous master serial port by
setting bits, SYNC, SPEN and CSRC.
pin (TXCKP = 0)
pin (TXCKP = 1)
SDO1/RP18 pin
RC7/RX1/DT1/
applicable to EUSART2 (RPn1/TX2/CK2 and RPn2/RX2/DT2).
(Interrupt)
RCREG1
CREN bit
RC1IF bit
bit SREN
SREN bit
Write to
EUSART SYNCHRONOUS MASTER
RECEPTION
Read
Q2
Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
‘0’
SYNCHRONOUS RECEPTION (MASTER MODE, SREN)
bit 0
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
bit 1
bit 2
bit 3
PIC18F46J50 FAMILY
3.
4.
5.
6.
7.
8.
9.
10. If any error occurred, clear the error by clearing
11. If using interrupts, ensure that the GIE and PEIE
Ensure bits, CREN and SREN, are clear.
If interrupts are desired, set enable bit, RCxIE.
If 9-bit reception is desired, set bit, RX9.
If a single reception is required, set bit, SREN.
For continuous reception, set bit, CREN.
Interrupt flag bit, RCxIF, will be set when
reception is complete and an interrupt will be
generated if the enable bit, RCxIE, was set.
Read the RCSTAx register to get the ninth bit (if
enabled) and determine if any error occurred
during reception.
Read the 8-bit received data by reading the
RCREGx register.
bit, CREN.
bits in the INTCON register (INTCON<7:6>) are
set.
bit 4
1
, and bit, BRGH =
bit 5
bit 6
0
. This example is equally
DS39931D-page 343
bit 7
Q1 Q2 Q3 Q4
‘0’