ATTINY25_14 Datasheet, PDF (5/34 Pages) ATMEL Corporation – Atmel 8-bit AVR Microcontroller with 2/4/8K

ATtiny25
2.4 Brown-Out Detection
Table 2-4. BODLEVEL Fuse Coding. T_A = -40°C to +125°C
BODLEVEL[2:0] Fuses
Min⁽¹⁾
Typ⁽¹⁾
Max⁽¹⁾
111
BOD Disabled
110
1.7
1.8
2.0
101
2.5
2.7
2.9
100
4.1
4.3
4.5
0XX
Reserved
Units
V
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.
2.5 Serial Programming Characteristics
Table 2-5.
Serial Programming Characteristics, T_A = -40°C to +125°C, V_CC = 1.8 - 5.5V
(Unless Otherwise Noted)
Symbol Parameter
Min
Typ Max Units
1/t_CLCL Oscillator Frequency (V_CC = 1.8 - 5.5V)
t_CLCL Oscillator Period (V_CC = 1.8 - 5.5V)
1/t_CLCL Oscillator Frequency (V_CC = 2.7 - 5.5V)
t_CLCL Oscillator Period (V_CC = 2.7 - 5.5V)
1/t_CLCL Oscillator Frequency (V_CC = 4.5V - 5.5V)
t_CLCL Oscillator Period (V_CC = 4.5V - 5.5V)
t_SHSL SCK Pulse Width High
t_SLSH SCK Pulse Width Low
t_OVSH MOSI Setup to SCK High
t_SHOX MOSI Hold after SCK High
t_SLIV
SCK Low to MISO Valid
Note: 1. 2 t_CLCL for f_ck < 12 MHz, 3 t_CLCL for f_ck >= 12 MHz
0
250
0
100
0
50
2 t_CLCL*
2 t_CLCL*
t_CLCL
2 t_CLCL
4
MHz
ns
10 MHz
ns
20 MHz
ns
ns
ns
ns
ns
100
ns
5
2586N-Appendix B–AVR–08/11