Справочник Пользователя для IBM EM78P259N/260N
EM78P259N/260N
8-Bit Microprocessor with OTP ROM
76
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Product Specification (V1.2) 05.18.2007
(This specification is subject to change without further notice)
IRC OSC Frequency (VDD=5V)
0
1
2
3
4
5
6
7
8
9
10
-40
-20
0
25
50
70
85
Temperature (℃)
Fr
eque
nc
y
(M
H
z)
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")
(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).