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MC68HC12 Datasheet, PDF (429/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
Electrical Specifications
Tables of Data
Table 21-12. Control Timing
Characteristic
Symbol
Frequency of operation
E-clock period
External oscillator frequency
Processor control setup time
tPCSU = tcyc/2+ 30
fo
tcyc
feo
tPCSU
Reset input pulse width
To guarantee external reset vector
Minimum input time (can be preempted by internal reset)
PWRSTL
Mode programming setup time
Mode programming hold time
Interrupt pulse width, IRQ edge-sensitive mode
PWIRQ = 2tcyc + 20
Wait recovery startup time
Timer input capture pulse width
tMPS
tMPH
PWIRQ
tWRS
PWTIM
1. When using a resonator (quartz or ceramic), see Table 21-17 for allowable values.
8.0 MHz
Min Max
0.004 8.0
0.125 250
0.5 16.0(1)
92
—
Unit
MHz
µs
MHz
ns
32
—
tcyc
2
—
tcyc
4
—
tcyc
20
—
ns
270 —
ns
—
4 cycles
270 —
ns
NOTE:
RESET is recognized during the first clock cycle it is held low. Internal
circuitry then drives the pin low for 16 clock cycles, releases the pin, and
samples the pin level 9 cycles later to determine the source of the
interrupt.
PT[7:0]1
PT[7:0]2
PWTIM
PT71
PT72
PWPA
NOTES:
1. Rising edge sensitive input
2. Falling edge sensitive input
Figure 21-1. Timer Inputs
MC68HC912DT128A — Rev 4.0
MOTOROLA
Electrical Specifications
Technical Data
429