Microchip Technology MCP3421DM-WS Data Sheet
© 2009 Microchip Technology Inc.
DS39632E-page 205
PIC18F2455/2550/4455/4550
FIGURE 19-5:
SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
FIGURE 19-6:
SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 1)
SCK
(CKP = 1
SCK
(CKP = 0
Input
Sample
Sample
SDI
bit 7
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
↓
bit 0
SCK
(CKP = 1
SCK
(CKP = 0
Input
Sample
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
SSPBUF
SSPSR to
SSPBUF
SS
Flag
Not Optional
Next Q4 Cycle
after Q2
after Q2
↓