PIC18F2450 MICROCHIP [Microchip Technology], PIC18F2450 Datasheet - Page 174

• Manufacturer Part Number: PIC18F2450
• Description: 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2450/4450
15.4.2
The operation of the Synchronous Master and Slave
modes is identical, except in the case of Sleep or any
Idle mode and bit SREN, which is a “don’t care” in
Slave mode.
If receive is enabled by setting the CREN bit prior to
entering Sleep or any Idle mode, then a word may be
received while in this low-power mode. Once the word
is received, the RSR register will transfer the data to the
RCREG register. If the RCIE enable bit is set, the
interrupt generated will wake the chip from the low-
power mode. If the global interrupt is enabled, the
program will branch to the interrupt vector.
TABLE 15-10: REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE RECEPTION
DS39760A-page 172
INTCON
PIR1
PIE1
IPR1
RCSTA
RCREG
TXSTA
BAUDCON
SPBRGH
SPBRG
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used for synchronous slave reception.
Name
EUSART SYNCHRONOUS SLAVE
RECEPTION
EUSART Receive Register
EUSART Baud Rate Generator Register High Byte
EUSART Baud Rate Generator Register Low Byte
GIE/GIEH PEIE/GIEL TMR0IE
ABDOVF
CSRC
SPEN
Bit 7
—
—
—
RCIDL
ADIF
ADIE
ADIP
Bit 6
RX9
TX9
SREN
TXEN
RCIE
RCIP
RCIF
Bit 5
—
Advance Information
INT0IE
CREN
SYNC
SCKP
TXIE
TXIP
Bit 4
TXIF
ADDEN
SENDB
BRG16
To set up a Synchronous Slave Reception:
1.
2.
3.
4.
5.
6.
7.
8.
9.
RBIE
Bit 3
—
—
—
Enable the synchronous master serial port by
setting bits SYNC and SPEN and clearing bit
CSRC.
If interrupts are desired, set enable bit RCIE.
If 9-bit reception is desired, set bit RX9.
To enable reception, set enable bit CREN.
Flag bit RCIF will be set when reception is
complete. An interrupt will be generated if
enable bit RCIE was set.
Read the RCSTA 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
RCREG register.
If any error occurred, clear the error by clearing
bit CREN.
If using interrupts, ensure that the GIE and PEIE
bits in the INTCON register (INTCON<7:6>) are
set.
TMR0IF
CCP1IE
CCP1IP
CCP1IF
BRGH
FERR
Bit 2
—
TMR2IF
TMR2IE
TMR2IP
INT0IF
OERR
TRMT
WUE
© 2006 Microchip Technology Inc.
Bit 1
TMR1IF
TMR1IE
TMR1IP
ABDEN
RX9D
TX9D
RBIF
Bit 0
on page
Values
Reset
49
51
51
51
51
50
51
51
50
50