Figure 23-14. SPI Master Waveforms (SSCPHA = 0)
SS1
(input)
TSLCH
TCLSH
TCHSH
TSLCL
TCHCH
TSHSL
TCLCH
SCK
(SSCPOL = 0)
(input)
TCHCX
TCLCX
TCHCL
SCK
(SSCPOL = 1)
(input)
TCHOV
TCLOV
TCHOX
TCLOX
TSLOV
SLAVE MSB OUT
TSHOX
MISO
(output)
BIT 6
SLAVE LSB OUT
1
TIVCH
TIVCL
TCHIX
TCLIX
MOSI
(input)
MSB IN
BIT 6
LSB IN
Note:
1. SS handled by software using general purpose port pin.
Figure 23-15. SPI Master Waveforms (SSCPHA = 1)
SS1
(output)
TCHCH
TCLCH
SCK
(SSCPOL = 0)
(output)
TCHCX
TCLCX
TCHCL
SCK
(SSCPOL = 1)
(output)
TIVCH
TCHIX
TIVCL TCLIX
SI
(input)
MSB IN
TCLOV
BIT 6
TCLOX
TCHOX
LSB IN
TCHOV
SO
(output)
Port Data
MSB OUT
BIT 6
LSB OUT
Port Data
Note:
1. SS handled by software using general purpose port pin.
23.3.4
23.3.4.1
Two-wire Interface
Timings
Table 36. TWI Interface AC Timing
166
AT89C5132
4173E–USB–09/07