Serial Downloading Waveforms
SERIAL CLOCK INPUT
SCK/P1.7
7
4
6
5
3
2
1
0
SERIAL DATA INPUT
MOSI/P1.5
LSB
MSB
SERIAL DATA OUTPUT
MISO/P1.6
LSB
MSB
Serial Programming Characteristics
Figure 16. Serial Programming Timing
MOSI
tOVSH
tSLSH
tSHOX
SCK
tSHSL
MISO
Table 11. Serial Programming Characteristics, TA = -40°C to 85°C, VCC = 4.0 - 6.0V (Unless Otherwise Noted)
Symbol
1/tCLCL
tCLCL
Parameter
Min
0
Typ
Max
Units
MHz
ns
Oscillator Frequency
Oscillator Period
24
41.6
tSHSL
SCK Pulse Width High
SCK Pulse Width Low
MOSI Setup to SCK High
MOSI Hold after SCK High
24 tCLCL
24 tCLCL
tCLCL
ns
tSLSH
ns
tOVSH
tSHOX
ns
2 tCLCL
ns
30
AT89S8252
0401G–MICRO–3/06
ATMEL [ ATMEL ]
