MC68HC05B4 Datasheet, PDF (274/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

14
Table H-12 Control timing for operation at 3.3V
Preliminary ^{(VDD = 3.3Vdc ± 10%,VSS = 0Vdc,TA = –40 to +85°C)}
Characteristic
Symbol Min
Frequency of operation
Crystal option
External clock option
f_OSC
—
f_OSC
dc
Internal operating frequency (f_OSC /2)
Using crystal
Using external clock
f_OP
—
f_OP
dc
Cycle time (see Figure 9-1)
t_CYC
1000
Crystal oscillator start-up time (see Figure 9-1) _Ot _XOV
—
Stop recovery start-up time (crystal oscillator)
IL^t CH
RC oscillator stabilization time
A^t DRC
Max Unit
2.0 MHz
2.0 MHz
1.0 MHz
1.0 MHz
—
ns
100 ms
100 ms
5
µs
A/D converter stabilization time
t_ADON
500
µs
External RESET input pulse width
t_RL
3.0
—
t _CYC
Preliminary Power-on RESET output pulse width
4064 cycle
16 cycle
Watchdog RESET output pulse width
Watchdog time-out
EEPROM byte erase time
0 to 70 (standard)
– 40 to 85 (extended)
EEPROM byte program time ⁽¹⁾
0 to 70 (standard)
– 40 to 85 (extended)
Timer (see Figure H-10)
Resolution⁽²⁾
Input capture pulse width
t_PORL
t_PORL
t_DOGL
t _DOG
t_ERA
t_{ER A}
t_{PR OG}
t_{PR O G}
t_RESL
t_TH, t_TL
4064
16
1.5
6144
30
30
30
30
4
250
—
—
t_CYC
t_CYC
—
t _CYC
7168 t _CYC
—
ms
—
ms
—
ms
—
ms
—
t_CYC
—
ns
Input capture pulse period
t_TLTL
— ⁽³⁾
—
t_CYC
Interrupt pulse width (edge-triggered)
I^tLIH
250
—
ns
Interrupt pulse period
t_ILIL
— ⁽⁴⁾
—
t _CYC
Preliminary ^{OSC1 pulse width(5)}
Write/Erase endurance⁽⁶⁾⁽⁷⁾
Data retention⁽⁶⁾⁽⁷⁾
t_OH , t_OL
—
—
100
—
10000
10
ns
cycles
years
(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 _C(t_YC ), this is the limiting
factor in determining the timer resolution.
(3) The minimum period t_TLTL should not be less than the number of cycle times it takes to
execute the capture interrupt service routine plus 24 _Ct _YC .
(4) The minimum period t_ILIL should not be less than the number of cycle times it takes to
execute the interrupt service routine plus 21 _Ct _YC .
(5) t_OH and t_OL should not total less than 500ns.
(6) At a temperature of 85°C
(7) Refer to Reliability Monitor Report (current quarterly issue) for current failure rate information.
MOTOROLA
H-28
MC68HC705B32
TPG
MC68HC05B6
Rev. 4