
MOTOROLA
E-26
MC68HC05B6
Rev. 4
MC68HC705B16
14
E.8
Control timing
(1) For bus frequencies less than 2 MHz, the internal RC oscillator should be used when
programming the EEPROM.
(2) Since a 2-bit prescaler in the timer must count four external cycles (t
CYC ), this is the limiting
factor in determining the timer resolution.
(3) The minimum period tTLTL should not be less than the number of cycle times it takes to
execute the capture interrupt service routine plus 24 tCYC .
(4) The minimum period tILIL should not be less than the number of cycle times it takes to
execute the interrupt service routine plus 21 tCYC .
(5) tOH and tOL 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 E-11 Control timing for 5V operation
(VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Characteristic
Symbol
Min
Max
Unit
Frequency of operation
Crystal option
External clock option
fOSC
—
dc
4.2
MHz
Internal operating frequency (fOSC /2)
Using crystal
Using external clock
fOP
dc
2.1
MHz
tCYC
480
—
ns
tOXOV
—
100
ms
Stop recovery start-up time (crystal oscillator)
tILCH
100
ms
RC oscillator stabilization time
tADRC
5
s
A/D converter stabilization time
tADON
500
s
External RESET input pulse width
tRL
1.5
—
tCYC
Power-on RESET output pulse width
4064 cycle
16 cycle
tPORL
4064
16
—
tCYC
Watchdog RESET output pulse width
t DOGL
1.5
—
tCYC
Watchdog time-out
tDOG
6144
7168
t CYC
EEPROM byte erase time
0 to 70 (standard)
– 40 to 85 (extended)
– 40 to 105 (industrial)
– 40 to 125 (automotive)
tERA
10
—
ms
EEPROM byte program time (1)
0 to 70 (standard)
– 40 to 85 (extended)
– 40 to 105 (industrial)
– 40 to 125 (automotive)
tPROG
10
15
20
—
ms
Resolution(2)
Input capture pulse width
Input capture pulse period
tRESL
tTH, tTL
tTLTL
4
125
— (3)
—
tCYC
ns
tCYC
Interrupt pulse width (edge-triggered)
tILIH
125
—
ns
Interrupt pulse period
tILIL
— (4)
—tCYC
OSC1 pulse width (5)
tOH, tOL
90
—
ns
Write/Erase endurance (6)(7) —
10000
cycles
—
10
years
TPG
210
05B6Book Page 26 Tuesday, April 6, 1999 8:24 am