RX71M_15 Datasheet, PDF (213/228 Pages) Renesas Technology Corp – Renesas MCUs

RX71M Group
5.9 Oscillation Stop Detection Timing
5. Electrical Characteristics
Table 5.52 Oscillation Stop Detection Circuit Characteristics
Conditions: VCC = AVCC0 = AVCC1 = VCC_USB = V_BATT = 2.7 to 3.6 V, 2.7 ≤ VREFH0 ≤ AVCC0,
VCC_USBA = AVCC_USBA = 3.0 to 3.6 V,
VSS = AVSS0 = AVSS1 = VREFL0 = VSS_USB = VSS1_USBA = VSS2_USBA = PVSS_USBA = AVSS_USBA = 0 V,
T_a = T_opr
Item
Detection time
Symbol
t_dr
Min.
Typ.
Max.
Unit
Test
Conditions
—
—
1
ms Figure 5.87
Main clock or
PLL clock
t_dr
OSTDSR.OSTDF
LOCO clock
ICLK
Figure 5.87 Oscillation Stop Detection Timing
5.10 Battery Backup Function Characteristics
Table 5.53 Battery Backup Function Characteristics
Conditions: VCC = AVCC0 = AVCC1 = VCC_USB = 2.7 to 3.6 V, 2.7 ≤ VREFH0 ≤ AVCC0,
VCC_USBA = AVCC_USBA = 3.0 to 3.6 V,
VSS = AVSS0 = AVSS1 = VREFL0 = VSS_USB = VSS1_USBA = VSS2_USBA = PVSS_USBA = AVSS_USBA = 0 V,
V_BATT = 2.0 to 3.6 V, T_a = T_opr
Item
Symbol
Min.
Typ.
Max.
Unit
Test
Conditions
Voltage level for switching to battery backup
Lower-limit V_BATT voltage for power supply switching due to
VCC voltage drop
VCC-off period for starting power supply switching
V_DETBATT
V_BATTSW
t_VOFFBATT
2.50
2.70
200
2.60
—
—
2.70
—
—
V Figure 5.88
μs
Note: The VCC-off period for starting power supply switching indicates the period in which VCC is below the minimum value of the
voltage level for switching to battery backup (V_DETBATT).
VCC
V_DETBATT
t_VOFFBATT
V_BATT
V_BATTSW
Figure 5.88
Backup power
area
VCC supply
V_BATT supply
Battery Backup Function Characteristics
R01DS0249EJ0100 Rev.1.00
Jan 15, 2015
VCC supply
Page 213 of 228