MC68HC05B6_13 Datasheet, PDF (284/302 Pages) Freescale Semiconductor, Inc – Microcontrollers

I.3
Control timing for 5V operation
(V_DD = 5.0 Vdc ± 10%, V_SS = 0 Vdc, T_A = –40 to +85°C)
Characteristic
Symbol
Frequency of operation
Crystal option
External clock option
Internal operating frequency (f_OSC/2)
Crystal
External clock
Cycle time (see Figure 9-1)
Crystal oscillator start-up time (see Figure 9-1)
Stop recovery start-up time (crystal oscillator)
External RESET input pulse width
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 I-1)
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⁾
f_OSC
f_OSC
f_OP
f_OP
t_CYC
t_OXOV
t_ILCH
t_RL
t_PORL
t_PORL
t_DOGL
t_DOG
t_ERA
t_ERA
t_PROG
t_PROG
t_RESL
t_TH, t_TL
t_TLTL
t_ILIH
t_ILIL
t_OH, t_OL
—
Data retention⁽⁵⁾⁽⁶⁾
—
Min
Max Unit
—
8.0 MHz
dc
8.0 MHz
—
4.0 MHz
dc
4.0 MHz
250
—
ns
—
100
ms
100
ms
1.5
—
t_CYC
4064
16
—
—
t_CYC
t_CYC
1.5
—
t_CYC
6144
7168 t_CYC
10
—
ms
10
—
ms
10
—
ms
10
—
ms
4
—
125
—
—⁽³⁾
—
125
—
—⁽⁴⁾
—
90
—
10000
10
t_CYC
ns
t_CYC
ns
t_CYC
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 (t_CYC), 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 t_CYC.
(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 t_CYC.
(5) At a temperature of 85°C
(6) Refer to Reliability Monitor Report (current quarterly issue) for current failure rate
information.
15
Freescale
I-4
HIGH SPEED OPERATION
MC68HC05B6
Rev. 4.1