HD64F2149 Datasheet, PDF (777/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

25.3.1 Clock Timing
Table 25.5 shows the clock timing. The clock timing specified here covers clock (ø) output and
clock pulse generator (crystal) and external clock input (EXTAL pin) oscillation settling times.
For details of external clock input (EXTAL pin and EXCL pin) timing, see section 23, Clock
Pulse Generator.
Table 25.5 Clock Timing
Condition: V_CC = 2.7 V to 3.6 V, V_CCB = 2.7 V to 5.5 V, V_SS = 0 V, ø = 2 MHz to maximum
operating frequency, T_a = –20 to +75°C
Item
Clock cycle time
Clock high pulse width
Clock low pulse width
Clock rise time
Clock fall time
Oscillation settling time at reset (crystal)
Oscillation settling time in software
standby (crystal)
External clock output stabilization delay
time
Symbol
t _cyc
t _CH
t _CL
t _Cr
t _Cf
t _OSC1
t _OSC2
t _DEXT
Condition
10 MHz
Min
Max
100
500
30
—
30
—
—
20
—
20
20
—
8
—
500
—
Test
Unit Conditions
ns Figure 25.4
ns Figure 25.4
ns
ns
ns
ms Figure 25.5
ms Figure 25.6
µs
t_cyc
t_CH
t_Cf
ø
t_CL
t_Cr
Figure 25.4 System Clock Timing
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