Datasheet

334
8018P–AVR–08/10
ATmega169P
Note: 1. V
BOT
may be below nominal minimum operating voltage for some devices. For devices where
this is the case, the device is tested down to V
CC
= V
BOT
during the production test. This guar-
antees that a Brown-Out Reset will occur before V
CC
drops to a voltage where correct
operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 110 for ATmega169V.
28.6 SPI Timing Characteristics
See Figure 28-4 on page 335 and Figure 28-5 on page 335 for details.
Table 28-5. BODLEVEL Fuse Coding
(1)
BODLEVEL 2..0 Fuses Min V
BOT
Typ V
BOT
Max V
BOT
Units
111 BOD Disabled
110 1.7 1.8 2.0
V101 2.5 2.7 2.9
100 4.1 4.3 4.5
011
Reserved
010
001
000
Table 28-6. SPI Timing Parameters
Description Mode Min Typ Max
1 SCK period Master
See Table 18-5 on
page 166
ns
2 SCK high/low Master 50% duty cycle
3 Rise/Fall time Master 3.6
4 Setup Master 10
5Hold Master 10
6 Out to SCK Master 0.5 • t
sck
7 SCK to out Master 10
8 SCK to out high Master 10
9SS low to out Slave 15
10 SCK period Slave 4 • t
ck
11 SCK high/low
(1)
Slave 2 • t
ck
12 Rise/Fall time Slave 1.6 µs
13 Setup Slave 10
ns
14 Hold Slave t
ck
15 SCK to out Slave 15
16 SCK to SS
high Slave 20
17 SS high to tri-state Slave 10
18 SS
low to SCK Slave 20 • t
ck