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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller PDIP 40 8-Bit 40 MHz I/O number 34
131132133134135136137138139140
PIC18FXX2
DS39564C-page 132 © 2006 Microchip Technology Inc.
FIGURE 15-5: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
FIGURE 15-6: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 1)
SCK
(CKP = 1
SCK
(CKP = 0
Input
Sample
SDI
bit7
bit0
SDO bit7
bit6
bit5 bit4
bit3
bit2
bit1 bit0
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
bit7
bit0
SDO bit7
bit6
bit5 bit4
bit3
bit2
bit1 bit0
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↓