PIC16F877-20L Datasheet, PDF (71/218 Pages) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

9.1.2 SLAVE MODE
In Slave mode, the data is transmitted and received as
the external clock pulses appear on SCK. When the last
bit is latched, the interrupt flag bit SSPIF (PIR1<3>) is set.
While in Slave mode, the external clock is supplied by
the external clock source on the SCK pin. This external
clock must meet the minimum high and low times as
specified in the electrical specifications.
PIC16F87X
While in SLEEP mode, the slave can transmit/receive
data. When a byte is received, the device will wake-up
from SLEEP.
Note 1: When the SPI module is in Slave
mode with SS pin control enabled
(SSPCON<3:0> = 0100), the SPI module
will reset if the SS pin is set to VDD.
2: If the SPI is used in Slave mode with
CKE = '1', then SS pin control must be
enabled.
FIGURE 9-3:
SS (optional)
SPI MODE TIMING (SLAVE MODE WITH CKE = 0)
SCK (CKP = 0)
SCK (CKP = 1)
SDO
SDI (SMP = 0)
SSPIF
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
bit7
bit0
FIGURE 9-4:
SS
SPI MODE TIMING (SLAVE MODE WITH CKE = 1)
SCK (CKP = 0)
SCK (CKP = 1)
SDO
SDI (SMP = 0)
SSPIF
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
bit7
bit0
 1998-2013 Microchip Technology Inc.
DS30292D-page 71