Datasheet

Section 17 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
Rev. 3.00 Sep. 14, 2006 Page 289 of 408
REJ09B0105-0300
Bit Bit Name
Initial
Value R/W Description
3 LVDSEL 0* R/W LVDR Detection Level Select
0: Reset detection voltage is 2.3 V (Typ.)
1: Reset detection voltage is 3.6 V (Typ.)
When the falling or rising voltage detection interrupt is
used, the reset detection voltage of 2.3 V (Typ.) should
be used. When only a reset detection interrupt is used,
reset detection voltage of 3.6 V (Typ.) should be used.
2 LVDRE 1* R/W LVDR Enable
0: Disables an LVDR
1: Enables an LVDR
1 LVDDE 0 R/W Voltage-Fall-Interrupt Enable
0: Interrupt on the power-supply voltage falling disabled
1: Interrupt on the power-supply voltage falling enabled
0 LVDUE 0 R/W Voltage-Rise-Interrupt Enable
0: Interrupt on the power-supply voltage rising disabled
1: Interrupt on the power-supply voltage rising enabled
Note: * Not initialized by an LVDR but initialized by a power-on reset or a watchdog timer reset.
Table 17.1 LVDCR Settings and Select Functions
LVDCR Settings Select Functions
LVDE BGRE VDDII LVDSEL LVDRE LVDDE LVDUE
Power-On
Reset LVDR
Low-
Voltage-
Detection
Fall
Interrupt
Low-
Voltage-
Detection
Rise
Interrupt
0 *
1
*
2
*
2
*
2
*
2
*
2
√   
1 1 *
1
1 1 0 0 √ √  
1 1 *
1
0 0 1 0 √  √ 
1 1 *
1
0 0 1 1 √  √ √
1 1 *
1
0 1 1 1 √ √ √ √
Notes: 1. Set these bits if necessary.
2. Settings are ignored.