
Electrical Specifications
Advance Information
68HC(9)12D60 — Rev 4.0
374
Electrical Specifications
MOTOROLA
Table 20-11. Pulse Width Modulator Characteristics
VDD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted
Characteristic
Symbol
Min
Max
Unit
E-clock frequency
feclk
0.004
8.0
MHz
A-clock frequency
Selectable
faclk
feclk/128
feclk
Hz
B-clock frequency
Selectable
fbclk
feclk/128
feclk
Hz
Left-aligned PWM frequency
8-bit
16-bit
flpwm
feclk/1M
feclk/256M
feclk/2
Hz
Left-aligned PWM resolution
rlpwm
feclk/4K
feclk
Hz
Center-aligned PWM frequency
8-bit
16-bit
fcpwm
feclk/2M
feclk/512M
feclk
Hz
Center-aligned PWM resolution
rcpwm
feclk/4K
feclk
Hz
Table 20-12. Control Timing
Characteristic
Symbol
8.0 MHz
Unit
Min
Max
Frequency of operation
fo
0.004
8.0
MHz
E-clock period
tcyc
0.125
250
s
External oscillator frequency
feo
0.5
16.0(1)
MHz
Processor control setup time
tPCSU = tcyc/2 + 20
tPCSU
82
—
ns
Reset input pulse width
To guarantee external reset vector
Minimum input time (can be preempted by internal reset)
PWRSTL
32
2
—
tcyc
Mode programming setup time
tMPS
4—
tcyc
Mode programming hold time
tMPH
10
—
ns
Interrupt pulse width, IRQ edge-sensitive mode
PWIRQ = 2tcyc + 20
PWIRQ
270
—
ns
Wait recovery startup time
tWRS
—4
tcyc
Timer input capture pulse width
PWTIM = 2tcyc + 20
PWTIM
270
—
ns
1. When using a quartz crystal, operation should be restricted to 8MHz.