Datasheet

Table Of Contents
PIC16(L)F1508/9
DS40001609C-page 192 2011-2013 Microchip Technology Inc.
21.2.6 SPI OPERATION IN SLEEP MODE
In SPI Master mode, module clocks may be operating
at a different speed than when in Full-Power mode; in
the case of the Sleep mode, all clocks are halted.
Special care must be taken by the user when the
MSSP clock is much faster than the system clock.
In Slave mode, when MSSP interrupts are enabled,
after the master completes sending data, an MSSP
interrupt will wake the controller from Sleep.
If an exit from Sleep mode is not desired, MSSP inter-
rupts should be disabled.
In SPI Master mode, when the Sleep mode is selected,
all module clocks are halted and the transmis-
sion/reception will remain in that state until the device
wakes. After the device returns to Run mode, the mod-
ule will resume transmitting and receiving data.
In SPI Slave mode, the SPI Transmit/Receive Shift
register operates asynchronously to the device. This
allows the device to be placed in Sleep mode and data
to be shifted into the SPI Transmit/Receive Shift
register. When all eight bits have been received, the
MSSP interrupt flag bit will be set and if enabled, will
wake the device.
TABLE 21-1: SUMMARY OF REGISTERS ASSOCIATED WITH SPI OPERATION
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on Page
ANSELA
ANSA4 ANSA2 ANSA1 ANSA0 113
INTCON GIE PEIE
TMR0IE INTE IOCIE TMR0IF INTF IOCIF 76
PIE1
TMR1GIE ADIE RCIE TXIE SSP1IE TMR2IE TMR1IE 77
PIR1
TMR1GIF ADIF RCIF TXIF SSP1IF TMR2IF TMR1IF 80
SSP1BUF Synchronous Serial Port Receive Buffer/Transmit Register 185*
SSP1CON1 WCOL SSPOV SSPEN CKP SSPM<3:0> 232
SSP1CON3
ACKTIM PCIE SCIE BOEN SDAHT SBCDE AHEN DHEN 234
SSP1STAT SMP CKE
D/A P S R/W UA BF 230
TRISA
TRISA5 TRISA4
(1)
TRISA2 TRISA1 TRISA0 112
TRISC
TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 120
Legend: — = Unimplemented location, read as ‘0’. Shaded cells are not used by the MSSP in SPI mode.
* Page provides register information.
Note 1: Unimplemented, read as ‘1’.