mc68hc705j2 Freescale Semiconductor, Inc, mc68hc705j2 Datasheet - Page 75

• Manufacturer Part Number: mc68hc705j2
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

10.6
MOTOROLA
10-8
IRQ (MCU
Edge-Sensitive Trigger — The minimum t
should not be less than the number of t
Edge and Level-Sensitive Trigger — If IRQ remains low after interrupt is serviced, the next interrupt is recognized.
IRQ (PIN
Control Timing (V
(V
Oscillator Frequency
Internal Operating Frequency
Cycle Time
RESET Pulse Width
Timer Resolution (NOTE 1)
Interrupt Pulse Width Low (Edge-Triggered)
Interrupt Pulse Period
OSC1 Pulse Width
Programming Time per Byte
NOTES:
IRQ
IRQ
1. The 2-bit timer prescaler is the limiting factor in determining timer resolution.
2. The minimum period t
DD
Crystal Option
External Clock Option
Crystal (f osc
External Clock (f osc
1
n
= 5.0 Vdc 10%, V
the interrupt service routine plus 19 t cyc .
Table 10-5. Control Timing (V
t
ILIH
Characteristic
Figure 10-6. External Interrupt Timing
2)
SS
t
ILIH
2)
= 0 Vdc; T
ILIL
ELECTRICAL SPECIFICATIONS
DD
should not be less than the number of cycle times it takes to execute
cyc
cycles it takes to execute the interrupt service routine plus 19 t
= 5.0 Vdc)
ILIH
is either 125 ns (V
t
ILIL
A
= T
L
to T
H
)
DD
= 5 V) or 250 ns (V
Symbol
t
OH
t
t
f osc
EPGM
t cyc
RESL
t
t
f op
t
ILIH
ILIL
RL
, t
OL
D D
= 5.0 Vdc)
(NOTE 2)
Min
480
125
1.5
4.0
—
dc
—
dc
90
DD
= 3 V). The period t
4
M a x
4.2
4.2
2.1
2.1
—
—
—
—
—
—
—
cycles.
cyc
NORMALLY
USED WITH
WIRED–OR
CONNECTIO
MC68HC705J2
Unit
MHz
MHz
t cyc
t cyc
t cyc
ms
ns
ns
ns
ILIL