EM78P312N
8-Bit Microcontroller
7.2 AC Electrical Characteristic
Ta=- 40°C ~ 85 °C, VDD=5V 5%, VSS=0V
Symbol
Parameter
Conditions
Min
Typ Max Unit
50 55
Dclk
Input CLK duty cycle
−
Crystal type (high frequency)
RC type
45
%
200
500
−
−
DC ns
DC ns
Instruction cycle time
(CLKS="0")
Tins
Ttcc
(Tins+20)/
N*
TCC input period
−
−
−
ns
Device reset hold
time
Tdrh
Trst
Ta = 25°C
11.3
2000
11.3
16.2 21.6 ms
ns
16.2 21.6 ms
/RESET pulse width Ta = 25°C
Watchdog timer
Ta = 25°C
period
−
−
Twdt
Tset
Input pin setup time
−
−
−
−
0
−
−
−
ns
ns
ns
ns
ns
ns
ns
ns
Thold Input pin hold time
20
50
Tdelay Output pin delay time Cload=20pF
−
Tstup1 SDI data setup time Setup time of SDI data input to SCK↑or SCK↓
Thold1 SDI data hold time Hold time of SDI data input to SCK↓or SCK↑
−
25 50
25 50
25 50
−
Tvalid1 SDO output valid time SCK↑or SCK↓to SDO data output
Tsckh SCK input high time Slave mode (Fmain=8 MHz)
−
200
200
−
−
−
−
Tsckl SCK input low time
Slave mode (Fmain=8 MHz)
Slave mode setup
Tsetup2
time
/SS↓ to SCK↑or SCK↓(Fmain=8 MHz)
400
−
−
ns
ns
Slave mode unselect
Tdelay1
/SS↑ to SDO output hi-impedance delay time
−
25 50
delay time
* N= selected prescaler ratio
62 •
Product Specification (V1.0) 10.03.2006
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
