RX23T Datasheet, PDF (58/98 Pages) Renesas Technology Corp – 40-MHz 32-bit RX MCUs, built-in FPU, 65.6 DMIPS

RX23T Group
5. Electrical Characteristics
Table 5.16 Clock Timing
Conditions: VCC = 2.7 V to 5.5 V, AVCC0 = VREFH0 = VCC to 5.5 V, VSS = AVSS0 = VREFL0 = 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 Figure 5.20
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*¹
t_EXWT
0.5
—
—
μs
Main clock oscillator oscillation frequency*²
f_MAIN
1
—
20
MHz
Main clock oscillation stabilization time (crystal)*²
t_MAINOSC
—
3
—
ms Figure 5.21
Main clock oscillation stabilization time (ceramic
t_MAINOSC
—
50
—
μs
resonator)*²
LOCO clock oscillation frequency
LOCO clock oscillation stabilization time
f_LOCO
3.44
4.0
4.56
MHz
t_LOCO
—
—
0.5
μs
Figure 5.22
IWDT-dedicated clock oscillation frequency
f_ILOCO
12.75
15
17.25
kHz
IWDT-dedicated clock oscillation stabilization time
t_ILOCO
—
—
50
μs
Figure 5.23
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
—
—
30
μs
Figure 5.25
PLL circuit oscillation frequency
f_PLL
24
—
40
MHz
PLL clock oscillation stabilization time
t_PLL
—
—
50
μs
Figure 5.26
PLL free-running oscillation frequency
f_PLLFR
—
8
—
MHz
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.
EXTAL external clock input
t_Xr
Figure 5.20 EXTAL External Clock Input Timing
t_Xcyc
t_XH
t_XL
t_Xf
VCC × 0.5
R01DS0248EJ0110 Rev.1.10
Jan 13, 2016
Page 58 of 98