Datasheet
2011 Microchip Technology Inc. DS39932D-page 341
PIC18F46J11 FAMILY
TABLE 20-6: REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION
20.2.4 AUTO-WAKE-UP ON SYNC BREAK
CHARACTER
During Sleep mode, all clocks to the EUSART are
suspended. Because of this, the BRG is inactive and a
proper byte reception cannot be performed. The
auto-wake-up feature allows the controller to wake-up
due to activity on the RXx/DTx line while the EUSART
is operating in Asynchronous mode.
The auto-wake-up feature is enabled by setting the
WUE bit (BAUDCONx<1>). Once set, the typical
receive sequence on RXx/DTx is disabled and the
EUSART remains in an Idle state, monitoring for a
wake-up event independent of the CPU mode. A
wake-up event consists of a high-to-low transition on
the RXx/DTx line. (This coincides with the start of a
Sync Break or a Wake-up Signal character for the
LIN/J2602 protocol.)
Following a wake-up event, the module generates an
RCxIF interrupt. The interrupt is generated synchro-
nously to the Q clocks in normal operating modes
(Figure 20-8) and asynchronously if the device is in
Sleep mode (Figure 20-9). The interrupt condition is
cleared by reading the RCREGx register.
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reset
Values
on Page:
INTCON GIE/GIEH PEIE/GIEL
TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 69
PIR1
PMPIF
(1)
ADIF RC1IF TX1IF SSP1IF CCP1IF TMR2IF TMR1IF 72
PIE1 PMPIE
(1)
ADIE RC1IE TX1IE SSP1IE CCP1IE TMR2IE TMR1IE 72
IPR1 PMPIP
(1)
ADIP RC1IP TX1IP SSP1IP CCP1IP TMR2IP TMR1IP 72
PIR3
SSP2IF BCL2IF RC2IF TX2IF TMR4IF CTMUIF TMR3GIF RTCCIF 72
PIE3 SSP2IE BCL2IE RC2IE TX2IE TMR4IE CTMUIE TMR3GIE RTCCIE 72
IPR3 SSP2IP BCL2IP RC2IP TX2IP TMR4IP CTMUIP TMR3GIP RTCCIP 72
RCSTAx SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 72
RCREGx EUSARTx Receive Register 72
TXSTAx
CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 72
BAUDCONx ABDOVF RCIDL
RXDTP TXCKP BRG16 — WUE ABDEN 73
SPBRGHx EUSARTx Baud Rate Generator Register High Byte 72
SPBRGx EUSARTx Baud Rate Generator Register Low Byte 72
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous reception.
Note 1: These bits are only available on 44-pin devices.