MOTOROLA
A-10
MC68HC05X16
Rev. 1
MC68HC05X32
15
A.3.4
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
cyc
.
(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
cyc
.
(5) At a temperature of 85
°
C.
(6) Refer to Reliability Monitor Report (currrent quarterly issue) for current failure rate information.
Table A-5
Control timing
(V
DD
= 5.0 Vdc
±
10%, V
SS
= 0 Vdc, T
A
= –40
°
C
to +125
°
C
)
Characteristic
Frequency of operation
Oscillator frequency
MCAN module clock frequency
MCU bus frequency
Cycle time (see
Figure 10-1
)
Crystal oscillator start-up time (see
Figure 10-1
)
Stop recovery start-up time (crystal oscillator)
A/D converter stabilization time
External RESET input pulse width
Power-on RESET output pulse width (mask option)
4064 cycle
16 cycle
Watchdog RESET output pulse width
Watchdog time-out
EEPROMbyte erase time
EEPROMbyte programtime
(1)
Timer (see
Figure A-3
)
Resolution
(2)
Input capture pulse width
Input capture pulse period
Interrupt pulse width (edge-triggered)
Interrupt pulse period
OSC1 pulse width
Write/erase endurance
(5)(6)
Data retention
(5)(6)
Symbol
Mn
Max
Unit
f
OSC
f
CAN
f
MCU
t
CYC
t
OXOV
t
ILCH
t
ADON
t
RL
0
0
0
22
11
2.2
—
100
100
500
—
MHz
MHz
MHz
ns
ms
ms
μ
s
t
CYC
455
—
1.5
t
PORL
t
PORL
t
DOGL
t
DOG
t
ERA
t
PROG
4064
16
1.5
6144
10
10
—
—
—
t
CYC
t
CYC
t
CYC
t
CYC
ms
ms
7168
10
10
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