
32
4109LS–8051–02/08
AT8xC51SND1C
Figure 7-16. SPI Master Waveforms (SSCPHA= 0)
Note:
1. SS handled by software using general purpose port pin.
Figure 7-17. SPI Master Waveforms (SSCPHA= 1)
Note:
1. SS handled by software using general purpose port pin.
7.4.1
Two-wire Interface
7.4.1.1
Timings
Table 34. TWI Interface AC Timing
MOSI
(input)
SCK
(SSCPOL= 0)
(output)
SS
(output)
SCK
(SSCPOL= 1)
(output)
MISO
(output)
T
CHCH
T
CLCX
T
CHCX
T
IVCL
T
CLIX
TCHIX
T
IVCH
T
CHOV
TCLOV
TCHOX
T
CLOX
MSB IN
BIT 6
LSB IN
MSB OUT
Port Data
LSB OUT
Port Data
BIT 6
T
CHCL
T
CLCH
MOSI
(input)
SCK
(SSCPOL= 0)
(output)
SS(1)
(output)
SCK
(SSCPOL= 1)
(output)
MISO
(output)
T
CHCH
T
CLCX
T
CHCX
T
IVCL
T
CLIX
T
CHIX
T
IVCH
T
CHOV
TCLOV
TCHOX
T
CLOX
MSB IN
BIT 6
LSB IN
MSB OUT
Port Data
LSB OUT
Port Data
BIT 6
T
CHCL
T
CLCH