PIC16F631/677/685/687/689/690
FIGURE 13-5:
SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
SS
Optional
SCK
(CKP = 0
CKE = 0)
SCK
(CKP = 1
CKE = 0)
Write to
SSPBUF
bit 6
bit 2
bit 5
bit 4
bit 1
bit 0
SDO
bit 7
bit 3
SDI
(SMP = 0)
bit 0
bit 7
Input
Sample
(SMP = 0)
SSPIF
Interrupt
Flag
Next Q4 Cycle
after Q2↓
SSPSR to
SSPBUF
FIGURE 13-6:
SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 1)
SS
Not Optional
SCK
(CKP = 0
CKE = 1)
SCK
(CKP = 1
CKE = 1)
Write to
SSPBUF
bit 6
bit 2
bit 5
bit 4
bit 1
bit 0
SDO
bit 7
bit 3
SDI
(SMP = 0)
bit 0
bit 7
Input
Sample
(SMP = 0)
SSPIF
Interrupt
Flag
Next Q4 Cycle
after Q2↓
SSPSR to
SSPBUF
DS41262D-page 182
© 2007 Microchip Technology Inc.