MC68HC05C8A Datasheet, PDF (110/116 Pages) Motorola, Inc – Microcontrollers

B.5 2.4-V to 3.6-V Control Timing
The data in 13.9 3.3-V Control Timing applies to the MC68HSC05C8A with the exceptions given here.
Characteristic
Symbol
Min
Max
Unit
Oscillator frequency
Crystal
External clock
f_OSC
—
4.2
MHz
dc
4.2
Internal operating frequency (f_OSC ÷ 2)
Crystal
External clock
f_OP
—
2.1
MHz
dc
2.1
Cycle time
t_CYC
480
—
ns
Crystal oscillator startup time
t_OXOV
100
ms
Stop recovery startup time
t_ILCH
100
ms
RESET pulse width
t_RL
1.5
—
t_CYC
Timer
Resolution⁽¹⁾
Input capture pulse width
Input capture pulse width
t_RESL
4.0
—
t_CYC
t_TH or t_TL
125
—
ns
t_THTL
(2)
—
t_CYC
Interrupt pulse width low (edge-triggered)
t_ILIH
125
—
ns
Interrupt pulse period
t_ILIL
(3)
—
t_CYC
OSC1 pulse width
t_OH or t_OL
90
—
ns
1. Because a 2-bit prescaler in the timer must count four internal cycles (t_CYC), this is the limiting minimum 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 t_ILIL should not be less than the number of cycle times it takes to execute the interrupt service routine plus
19 t_CYC.
MC68HC05C8A • MC68HCL05C8A • MC68HSC05C8A Data Sheet, Rev. 5.1
110
Freescale Semiconductor