MC68HC05F8 Datasheet, PDF (117/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
13.5
Control Timing
Table 13-6 Control Timing for 5V Operation
(V_DD=5.0Vdc ±10%, V_SS=0Vdc, temperature range=0 to 70°C)
CHARACTERISTICS
SYMBOL MINIMUM MAXIMUM UNIT
Frequency of operation
Crystal option
External clock option
f_OSC
–
dc
3.58
MHz
3.58
MHz
Internal operating frequency (f_OSC/2)
Crystal
External clock
f_OP
–
f_OP
dc
Processor cycle time
t_CYC
556
Crystal oscillator start-up time
t_OXOV
–
Stop recovery start-up time (crystal oscillator)
t_ILCH
External RESET pulse width
t_RL
1.5
Power-on RESET output pulse width
4064 cycle
16 cycle
t_PORL
t_PORL
4064
16
Watchdog RESET output pulse width
t_DOGL
1.5
Watchdog time-out
t_DOG
0.25
Timer A
Resolution⁽¹⁾
Input capture pulse width
Input capture pulse period
t_ARESL
4
t_TH, t_TL
125
t_TLTL
–⁽²⁾
Timer B
Resolution
t_BRESL
2.25
Interrupt pulse width (edge-triggered)
Interrupt pulse period
t_ILIH
125
t_ILIL
–⁽³⁾
1.8
MHz
1.8
MHz
–
ns
100
ms
100
ms
–
t_CYC
–
t_CYC
–
t_CYC
–
t_CYC
4
sec
64
t_CYC
–
ns
–
t_CYC
18
µs
–
ns
–
t_CYC
(1) 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.
(2) 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.
(3) 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.
13
MC68HC05F8
ELECTRICAL SPECIFICATIONS
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13-5