Datasheet

28
1919C–MICRO–3/05
AT89S52
25. Serial Programming Characteristics
Figure 25-1. Serial Programming Timing
MOSI
MISO
SCK
t
OVSH
t
SHSL
t
SLSH
t
SHOX
t
SLIV
Table 25-1. Serial Programming Characteristics, T
A
= -40°C to 85°C, V
CC
= 4.0 - 5.5V (Unless Otherwise Noted)
Symbol Parameter Min Typ Max Units
1/t
CLCL
Oscillator Frequency 3 33 MHz
t
CLCL
Oscillator Period 30 ns
t
SHSL
SCK Pulse Width High 8 t
CLCL
ns
t
SLSH
SCK Pulse Width Low 8 t
CLCL
ns
t
OVSH
MOSI Setup to SCK High t
CLCL
ns
t
SHOX
MOSI Hold after SCK High 2 t
CLCL
ns
t
SLIV
SCK Low to MISO Valid 10 16 32 ns
t
ERASE
Chip Erase Instruction Cycle Time 500 ms
t
SWC
Serial Byte Write Cycle Time 64 t
CLCL
+ 400 µs