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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SSOP 28 8-Bit 20 MHz I/O number 22
71727374757677787980
PIC16F87XA
DS39582C-page 78 2001-2013 Microchip Technology Inc.
FIGURE 9-5: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0 )
FIGURE 9-6: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 1 )
SCK
(CKP = 1
SCK
(CKP = 0
Input
Sample
SDI
bit 7
bit 0
SDO bit 7
bit 6
bit 5 bit 4
bit 3
bit 2
bit 1 bit 0
SSPIF
Interrupt
(SMP = 0)
CKE = 0)
CKE = 0)
(SMP = 0)
Write to
SSPBUF
SSPSR to
SSPBUF
SS
Flag
Optional
Next Q4 Cycle
after Q2
SCK
(CKP = 1
SCK
(CKP = 0
Input
Sample
SDI
bit 7
bit 0
SDO bit 7
bit 6
bit 5 bit 4
bit 3
bit 2
bit 1 bit 0
SSPIF
Interrupt
(SMP = 0)
CKE = 1)
CKE = 1)
(SMP = 0)
Write to
SSPBUF
SSPSR to
SSPBUF
SS
Flag
Not Optional
Next Q4 Cycle
after Q2