PIC17C7XX Datasheet, PDF (139/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
FIGURE 15-11: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
SS
optional
SCK
(CKP = 0
CKE = 0)
SCK
(CKP = 1
CKE = 0)
Write to
SSPBUF
SDO
bit7
bit6
bit5
bit4
bit3
bit2
SDI
(SMP = 0)
bit7
Input
Sample
(SMP = 0)
SSPIF
Interrupt
Flag
SSPSR to
SSPBUF
bit1
bit0
bit0
Next Q4 cycle
after Q2↓
FIGURE 15-12: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 1)
SS
not optional
SCK
(CKP = 0
CKE = 1)
SCK
(CKP = 1
CKE = 1)
Write to
SSPBUF
SDO
SDI
(SMP = 0)
Input
Sample
(SMP = 0)
SSPIF
Interrupt
Flag
SSPSR to
SSPBUF
bit7
bit6
bit5
bit4
bit3
bit2
bit7
bit1 bit0
bit0
Next Q4 cycle
after Q2↓
© 1998 Microchip Technology Inc.
DS30289A-page 139