
173
8024A–AVR–04/08
ATmega8HVA/16HVA
Note:
1. 2.2 t
CLCL for fck < 12 MHz, 3 tCLCL for fck >= 12 MHz
29.8.2
High-voltage Serial Programming
Figure 29-4. High-voltage Serial Programming Timing
Table 29-8.
Serial Programming Characteristics, T
A = -10°C to 70°C, VCC = 3.0 - 5.5V (Unless Otherwise Noted)
Symbol
Parameter
Min
Typ
Max
Units
1/tCLCL
Oscillator Frequency (ATmega8HVA/16HVA)
0
4
MHz
tCLCL
Oscillator Period (ATmega8HVA/16HVA)
250
ns
tSHSL
SCK Pulse Width High
tSLSH
SCK Pulse Width Low
2.2 tCLCL
tOVSH
MOSI Setup to SCK High
tCLCL
tSHOX
MOSI Hold after SCK High
2 tCLCL
tSLIV
SCK Low to MISO Valid
15
ns
Table 29-9.
High-voltage Serial Programming Characteristics T
A = 25°C ± 10%, VCC = 3.3V ±
10% (Unless otherwise noted)
Symbol
Parameter
Min
Typ
Max
Units
tSHSL
SCI (PC0) Pulse Width High
1/fck
ns
tSLSH
SCI (PC0) Pulse Width Low
1/f
ck
ns
tIVSH
SDI (PB2), SII (PB3) Valid to SCI (PC0) High
50
ns
tSHIX
SDI (PB2), SII (PB3) Hold after SCI (PC0) High
50
ns
tSHOV
SCI (PC0) High to SDO (PB1) Valid
16
ns
tWLWH_PFB
Wait after Instr. 3 for Write Fuse Bits
2.5
ms
SDI , SII
SDO
SCI
t
IVSH
t
SHSL
t
SLSH
t
SHIX
t
SHOV