R01UH0822EJ0100 Rev.1.00
Page 999 of 1041
Jul 31, 2019
RX13T Group
32. Electrical Characteristics
Note 1. Time until the clock can be used after the main clock oscillator stop bit (MOSCCR.MOSTP) is set to 0 (operating) when the
external clock is stable.
Note 2. Reference values when an 8-MHz resonator is used.
When specifying the main clock oscillator stabilization time, set the MOSCWTCR register with a stabilization time value that is
equal to or greater than the resonator-manufacturer-recommended value.
After changing the setting of the MOSCCR.MOSTP bit so that the main clock oscillator operates, read the OSCOVFSR.MOOVF
flag to confirm that is has become 1, and then start using the main clock.
Figure 32.4
EXTAL External Clock Input Timing
Table 32.21
Clock Timing
Conditions: VCC = 2.7 V to 5.5 V, AVCC0 = VCC to 5.5 V, VSS = AVSS0 = 0 V, T
a
= –40 to +105°C
Item
Symbol
Min.
Typ.
Max.
Unit
Test Conditions
EXTAL external clock input cycle time
t
Xcyc
50
—
—
ns
EXTAL external clock input high pulse width
t
XH
20
—
—
ns
EXTAL external clock input low pulse width
t
XL
20
—
—
ns
EXTAL external clock rise time
t
Xr
—
—
5
ns
EXTAL external clock fall time
t
Xf
—
—
5
ns
EXTAL external clock input wait time
t
EXWT
0.5
—
—
μs
Main clock oscillator oscillation frequency
f
MAIN
1
—
20
MHz
Main clock oscillation stabilization time (crystal)
t
MAINOSC
—
3
—
ms
Main clock oscillation stabilization time (ceramic
resonator)
t
MAINOSC
—
50
—
μs
LOCO clock oscillation frequency
f
LOCO
3.44
4.0
4.56
MHz
LOCO clock oscillation stabilization time
t
LOCO
—
—
0.5
μs
IWDT-dedicated clock oscillation frequency
f
ILOCO
12.75
15
17.25
kHz
IWDT-dedicated clock oscillation stabilization time
t
ILOCO
—
—
50
μs
HOCO clock oscillation frequency
f
HOCO
31.52
32
32.48
MHz
T
a
= –40 to +85°C
31.68
32
32.32
T
a
= –20 to +85°C
31.36
32
32.64
T
a
= –40 to +105°C
HOCO clock oscillation stabilization time
t
HOCO
—
—
41.3
μs
PLL circuit oscillation frequency
f
PLL
24
—
32
MHz
PLL clock oscillation stabilization time
t
PLL
—
—
74.4
μs
PLL free-running oscillation frequency
f
PLLFR
—
8
—
MHz
t
XH
t
Xcyc
EXTAL external clock input
VCC × 0.5
t
XL
t
Xr
t
Xf