EM78P259N/260N

8-Bit Microprocessor with OTP ROM

76 • Product Specification (V1.2) 05.18.2007
(This specification is subject to change without further notice)

IRC OSC Fr equency (V DD= 5V)

0
1
2
3
4
5
6
7
8
9
10
-40-20 0 25507085

Temper at ur e ( ℃ )

Frequency (M Hz)

Fig. 8-2 Internal RC OSC Frequency vs. Temperature, VDD=5V
9 AC Electrical Characteristic

Ta=25°C, VDD=5V±5%, VSS=0V

Symbol Parameter Conditions Min Typ Max Unit
Dclk Input CLK duty cycle 45 50 55 %
Crystal type 100 DC ns
Tins Instruction cycle time
(CLKS="0") RC type 500 DC ns
Ttcc TCC input period (Tins+20)/N* ns
Tdrh Device reset hold time Ta = 25°C 11.3 16.2 21.6 ms
Trst /RESET pulse width Ta = 25°C 2000 ns
Twdt Watchdog timer period
Ta = 25°C 11.3 16.2 21.6 ms
Tset Input pin setup time 0 ns
Thold Input pin hold time 15 20 25 ns
Tdelay Output pin delay time Cload=20pF 45 50 55 ns
Tdrc ERC delay time Ta = 25°C 1 3 5 ns
Note: 1. N = selected prescaler ratio
2. Twdt1: The Option Word1 (WDTPS) is used to define the oscillator set-up time. WDT timeout length is
the same as set-up time (18ms).
3. Twdt2: The Option Word1 (WDTPS) is used to define the oscillator set-up time. WDT timeout length is
the same as set-up time (4.5ms).
4. These parameters are hypothetical (not tested) and are provided for design reference only.
5. Data under minimum, typical, & maximum (Min, Typ, & Max) columns are based on hypothetical results at 25°C.
These data are for design reference use only.
6. The Watchdog timer duration is determined by Code Option Word1 (WDTPS).