MC68HC05C9A Datasheet, PDF (93/124 Pages) Freescale Semiconductor, Inc – Microcontrollers

12.7 5.0-Volt Control Timing
5.0-Volt Control Timing
Characteristic⁽¹⁾
Symbol
Min
Max
Unit
Frequency of operation
Crystal
External clock
f_OSC
—
dc
4.2
MHz
4.2
Internal operating frequency (f_OSC ÷ 2)
Crystal
External clock
f_OP
—
dc
2.1
MHz
2.1
Cycle time
Crystal oscillator startup time
Stop recovery startup time (crystal oscillator)
RESET pulse width
Timer
Resolution⁽²⁾
Input capture pulse width
Input capture pulse period
t_cyc
480
t_OXOV
—
t_ILCH
—
t_RL
1.5
t_RESL
4.0
t_TH, t_TL
125
t_TLTL
(3)
—
ns
100
ms
100
ms
—
t_cyc
—
t_cyc
—
ns
—
t_cyc
Interrupt pulse width low (edge-triggered)
Interrupt pulse period
t_ILIH
125
t_ILIL
(4)
—
ns
—
t_cyc
OSC1 pulse width
t_OH, t_OL
90
—
ns
1. V_DD = 5.0 Vdc ± 10%, V_SS = 0 Vdc, T_A = –40 to +125°C, unless otherwise noted
2. Because a 2-bit prescaler in the timer must count four internal cycles (t_CYC), this is the limiting minimum factor in deter-
mining 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 t_ILIL should not be less than the number of cycle times it takes to execute the interrupt service routine plus
19 t_CYC.
MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
Freescale Semiconductor
93