MC68HC912DG128 Datasheet, PDF (395/452 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Electrical Specifications
Tables of Data
Table 19-12. Control Timing
Characteristic
Frequency of operation
E-clock period
External oscillator frequency
Processor control setup time
t_PCSU = t_cyc/2+ 20
Reset input pulse width
To guarantee external reset vector
Minimum input time (can be preempted by internal reset)
Mode programming setup time
Mode programming hold time
Interrupt pulse width, IRQ edge-sensitive mode
PW_IRQ = 2t_cyc + 20
Wait recovery startup time
Timer input capture pulse width (PW_TIM = 2 t_cyc + 20)
1. When using a quartz crystal, operation should be restricted to 8MHz.
Symbol
f_o
t_cyc
f_eo
t_PCSU
8.0 MHz
Min Max
0.004 8.0
0.125 250
0.5 _16.0⁽¹⁾
Unit
MHz
µs
MHz
82
—
ns
PW_RSTL
32
—
t_cyc
2
—
t_cyc
t_MPS
4
—
t_cyc
t_MPH
10
—
ns
PW_IRQ
270 —
ns
t_WRS
PW_TIM
—
4 cycles
270 —
ns
1. 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 8 cycles later
to determine the source of the interrupt.
PT[7:0]¹
PT[7:0]²
PW_TIM
PT7¹
PT7²
PW_PA
NOTES:
1. Rising edge sensitive input
2. Falling edge sensitive input
Figure 19-3. Timer Inputs
MC68HC912DG128 — Rev 3.0
MOTOROLA
Electrical Specifications
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Technical Data
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