MOTOROLA
F-24
MC68HC05B6
Rev. 4
MC68HC705B16N
14
F.9
Control timing
(1) For bus frequencies less than 2 MHz, the internal RC oscillator should be used when
programmng the EEPROM.
(2) Since a 2-bit prescaler in the timer must count four external cycles (t
CYC
), this is the limting
factor in determning the timer resolution.
(3) The mnimumperiod t
should not be less than the number of cycle times it takes to
execute the capture interrupt service routine plus 24 t
.
(4) The mnimumperiod t
should not be less than the number of cycle times it takes to execute
the interrupt service routine plus 21 t
.
(5) t
and t
should not total less than 238ns.
(6) At a temperature of 85
°
C
(7) Refer to Reliability Monitor Report (current quarterly issue) for current failure rate information.
Table F-11
Control timing for 5V operation
(V
DD
= 5.0 Vdc
±
10%, V
SS
= 0 Vdc, T
A
= T
L
to T
H
)
Characteristic
Frequency of operation
Crystal option
External clock option
Internal operating frequency (f
OSC
/2)
Using crystal
Using external clock
Cycle time (see Figure 9-1)
Crystal oscillator start-up time (see Figure 9-1)
Stop recovery start-up time (crystal oscillator)
RC oscillator stabilization time
A/D converter stabilization time
External RESET input pulse width
Power-on RESET output pulse width
4064 cycle
16 cycle
Watchdog RESET output pulse width
Watchdog time-out
EEPROMbyte erase time
0 to 70 (standard)
– 40 to 85 (extended)
– 40 to 105 (industrial)
– 40 to 125 (automotive)
EEPROMbyte programtime
(1)
0 to 70 (standard)
– 40 to 85 (extended)
– 40 to 105 (industrial)
– 40 to 125 (automotive)
Timer (see Figure F-10)
Resolution
(2)
Input capture pulse width
Input capture pulse period
Interrupt pulse width (edge-triggered)
Interrupt pulse period
OSC1 pulse width
(5)
Write/Erase endurance
(6)
Data retention
(6)(7)
Symbol
Mn
Max
Unit
f
OSC
f
OSC
—
dc
4.2
4.2
MHz
MHz
f
OP
f
OP
t
CYC
t
OXOV
t
ILCH
t
ADRC
t
ADON
t
RL
dc
dc
480
—
2.1
2.1
—
100
100
5
500
—
MHz
MHz
ns
ms
ms
μ
s
μ
s
t
CYC
3.0
t
PORL
t
PORL
t
DOGL
t
DOG
4064
16
1.5
6144
—
—
—
t
CYC
t
CYC
t
CYC
t
CYC
7168
t
ERA
t
ERA
t
ERA
t
ERA
10
10
10
10
—
—
—
—
ms
ms
ms
ms
t
PROG
t
PROG
t
PROG
t
PROG
10
10
15
20
—
—
—
—
ms
ms
ms
ms
t
RESL
t
TH
, t
TL
t
TLTL
t
ILIH
t
ILIL
t
OH
, t
OL
—
—
4
125
—
(3)
125
—
(4)
90
—
—
—
—
—
—
t
CYC
ns
t
CYC
ns
t
CYC
ns
cycles
years
10000
10
TPG