Rainbow Electronics Atmega169L - Manual (Page 298)

298
ATmega169V/L
2514A–AVR–08/02
External Clock Drive
Waveforms Figure 135. External Clock Drive Waveforms
External Clock Drive
SPI Timing
Characteristics See Figure 136 and Figure 137 for details.
V
IL1
V
IH1
Table 133. External Clock Drive
Symbol Parameter
V
CC
= 1.8 - 3.6V V
CC
= 2.7 - 3.6V
Units Min. Max. Min. Max.
1/t
CLCL
Oscillator Frequency 0 TBD 0 TBD MHz
t
CLCL
Clock Period TBD TBD ns
t
CHCX
High Time TBD TBD ns
t
CLCX
Low Time TBD TBD ns
t
CLCH
Rise Time TBD TBD µs
t
CHCL
Fall Time TBD TBD
µs
∆
t
CLCL
Change in period from one clock
cycle to the next
2 2 %
Table 134. SPI Timing Parameters
Description Mode Min Typ Max
1 SCK period Master See Table 69
ns
2 SCK high/low Master 50% duty cycle
3 Rise/Fall time Master TBD
4 Setup Master TBD
5 Hold Master TBD
6 Out to SCK Master TBD
7 SCK to out Master TBD
8 SCK to out high Master TBD
9 SS low to out Slave TBD
10 SCK period Slave 4 • t
ck
TBD
11 SCK high/low Slave 2 • t
ck
TBD
12 Rise/Fall time Slave TBD
13 Setup Slave TBD
14 Hold Slave TBD
15 SCK to out Slave TBD
16 SCK to SS high Slave TBD
17 SS high to tri-state Slave TBD