MC908GR32AVFAE Datasheet, PDF (283/314 Pages) Freescale Semiconductor, Inc – Microcontrollers

20.7 5.0-Volt Control Timing
5.0-Volt Control Timing
Characteristic⁽¹⁾
Symbol
Min
Max
Frequency of operation
Crystal option
External clock option⁽²⁾
f_OSC
1
8
dc
32
Internal operating frequency
Internal clock period (1/f_OP)
RESET input pulse width low
IRQ interrupt pulse width low (edge-triggered)
IRQ interrupt pulse period⁽³⁾
f_OP (f_Bus)
—
8
t_CYC
125
—
t_RL
100
—
t_ILIH
100
—
t_ILIL
Note 3
—
1. V_SS = 0 Vdc; timing shown with respect to 20% V_DD and 70% V_DD unless otherwise noted.
2. No more than 10% duty cycle deviation from 50%.
3. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 t_CYC.
Unit
MHz
MHz
ns
ns
ns
t_CYC
20.8 3.3-Volt Control Timing
Characteristic⁽¹⁾
Frequency of operation
Crystal option
External clock option⁽²⁾
Internal operating frequency
Internal clock period (1/f_OP)
RESET input pulse width low
IRQ interrupt pulse width low (edge-triggered)
IRQ interrupt pulse period⁽³⁾
Symbol
f_OSC
f_OP (f_Bus)
t_CYC
t_RL
t_ILIH
t_ILIL
Min
1
dc
—
250
200
200
Note 3
Max
8
16
4
—
—
—
—
1. V_SS = 0 Vdc; timing shown with respect to 20% V_DD and 70% V_DD unless otherwise noted.
2. No more than 10% duty cycle deviation from 50%.
3. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 t_CYC.
Unit
MHz
MHz
ns
ns
ns
t_CYC
t_RL
RST
t_ILIL
t_ILIH
IRQ
Figure 20-1. RST and IRQ Timing
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
Freescale Semiconductor
283