
2000 Microchip Technology Inc.
Advanced Information
DS30475A-page 145
PIC18CXX8
FIGURE 15-4: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
FIGURE 15-5: 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
(SMP = 0)
CKE = 0)
(SMP = 0)
Write to
SSPBUF
SSPSR to
SSPBUF
SS
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
(SMP = 0)
CKE = 1)
(SMP = 0)
Write to
SSPBUF
SSPSR to
SSPBUF
SS
Required
Next Q4 Cycle
after Q2
↓