Rainbow Electronics ATmega128RFA1 - Manual (Page 504)

504
8266A-MCU Wireless-12/09
ATmega128RFA1
Symbol Parameter Condition Min. Max. Units
V
IH
Input High-voltage 0.7V
DEVDD
V
DEVDD
+0.5 V
V
hys
Hysteresis of Schmitt Trigger Inputs V
V
OL
Output Low-voltage 3mA sink current 0 0.4 V
t
r
Rise Time for both SDA and SCL 300 ns
t
of
Output Fall Time from V
IHmin
to V
ILmax
250 ns
t
SP
Spikes suppressed by the input filter 50 ns
Figure 34-2
t
SU;STA
t LOW
t
HIGH
t LOW
t
of
t HD;STA t HD;DAT t
SU;DAT
t
SU;STO
t
BUF
SCL
SDA
t
r
34.6 SPI Timing Characteristics
See Figure 34-3and Figure 34-4 for details.
Table 34-9. SPI Timing Parameters
Description Mode Min Typ Max Units
SCK period Master See "SPCR – SPI Control Register" on
page 336 .
SCK high/low Master 50% duty cycle
Rise/fall time Master TBD
Setup Master TBD
Hold Master TBD
Out to SCK Master 0.5 t
SCK
SCK to out Master TBD
SCK to out high Master TBD
SS
__
low to out Slave TBD
SCK period Slave 4 t
CK
SCK high/low
( 1 )
Slave 2 t
CK
Rise/fall time Slave TBD
Setup Slave TBD
Hold Slave t
CK
SCK to out Slave TBD
SCK to SS
__
high Slave TBD
SS
__
high to tri-state Slave TBD
SS
__
low to SCK Slave TBD
ns
Note: 1. In SPI Programming mode the minimum SCK high/low period is 2 t
CLCL
for f
CK
< 12
MHz and 3 t
CLCL
for f
CK
> 12 MHz.