Datasheet

Section 26 Electrical Characteristics
Page 1294 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
26.1.3 AC Characteristics
The following shows the timings of the clock, control signals, bus, DMAC, EXDMAC, and on-
chip peripheral functions. For the AC characteristic test conditions, see figure 26.1.
(1) Clock Timing
Table 26.5 Clock Timing
Conditions: V
CC
= 3.0 V to 3.6 V, AV
CC
= 3.0 V to 3.6 V, V
ref
= 3.0 V to AV
CC
, V
SS
= AV
SS
= 0 V,
φ = 8 MHz to 33 MHz
Item Symbol Min. Max. Unit Test Conditions
Clock cycle time t
cyc
30.3 125 ns Figure 26.3
Clock pulse high width t
CH
10 ⎯ ns Figure 26.3
Clock pulse low width t
CL
10 ⎯ ns
Clock rising time t
Cr
⎯ 5 ns
Clock falling time t
Cf
⎯ 5 ns
Reset oscillation settling time
(crystal)
t
OSC1
15 ⎯ ms Figure 26.5(1)
Software standby oscillation
settling time (crystal)
t
OSC2
5 ⎯ ms Figure 26.5(2)
External clock output delay
settling time
t
DEXT
15 ⎯ ms Figure 26.5(1)
Clock phase difference
*
t
cdif
1/4 × t
cyc
−3 1/4 × t
cyc
+3 ns Figure 26.4
Clock pulse high width
(SDRAMφ)
*
t
SDCH
10 ⎯ ns Figure 26.4
Clock pulse low width
(SDRAMφ)
*
t
SDCL
10 ⎯ ns Figure 26.4
Clock rising time (SDRAMφ)
*
t
sdcr
⎯ 5 ns Figure 26.4
Clock falling time (SDRAMφ)
*
t
sdcf
⎯ 5 ns Figure 26.4
Note: * Supported only by the H8S/2456R Group.