Datasheet

1. Values are guidelines only.
29.10. Parallel Programming Characteristics
Table 29-13. Parallel programming characteristics, VCC = 5V ±10%.
Symbol Parameter Min. Typ. Max. Units
V
PP
Programming Enable Voltage 11.5 - 12.5 V
I
PP
Programming Enable Current - 250 µA
t
DVXH
Data and Control Valid before XTAL1 High 67 - - ns
t
XLXH
XTAL1 Low to XTAL1 High 300 - - ns
t
XHXL
XTAL1 Pulse Width High 150 - - ns
t
XLDX
Data and Control Hold after XTAL1 Low 67 - - ns
t
XLWL
XTAL1 Low to WR Low 0 - - ns
t
XLPH
XTAL1 Low to PAGEL high 0 - - ns
t
PLXH
PAGEL low to XTAL1 high 150 - - ns
t
BVPH
BS1 Valid before PAGEL High 67 - - ns
t
PHPL
PAGEL Pulse Width High 200 - - ns
t
PLBX
BS1 Hold after PAGEL Low 67 - - ns
t
WLBX
BS2/1 Hold after WR Low 67 - - ns
t
PLWL
PAGEL Low to WR Low 67 - - ns
t
BVWL
BS2/1 Valid to WR Low 67 - - ns
t
WLWH
WR Pulse Width Low 150 - - ns
t
WLRL
WR Low to RDY/BSY Low 0 - 1 µs
t
WLRH
WR Low to RDY/BSY High
(1)
2 - 4.5 ms
t
WLRH_CE
WR Low to RDY/BSY High for Chip Erase
(2)
7.5 - 12
t
XLOL
XTAL1 Low to OE Low 0 - - ns
t
BVDV
BS1 Valid to DATA valid 0 - 500
t
OLDV
OE Low to DATA Valid - - 500
t
OHDZ
OE High to DATA Tri-stated - - 500
Note:
1. t
WLRH
is valid for the Write Flash, Write EEPROM, Write Fuse bits and Write Lock bits commands.
2. t
WLRH_CE
is valid for the Chip Erase command.
Atmel ATmega644A [DATASHEET]
Atmel-42716C-ATmega644A_Datasheet_Complete-10/2016
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