UPD30121 Datasheet, PDF (11/76 Pages) NEC – VR4121TM 64-/32-BIT MICROPROCESSOR

µPD30121
(3) Battery monitor interface signals
Signal
BATTINH/
BATTINT#
I/O
Function
I This function differs depending on how the MPOWER signal is set.
<When MPOWER signal = 0>
BATTINH function
This signal enables/prohibits activation due to power-on.
1 : Enable activation
0 : Prohibit activation
<When MPOWER signal = 1>
BATTINT# function
This is an interrupt signal that is output when remaining power is low during normal operations. The
external agent checks the remaining battery power. Activate the signal at this pin if voltage sufficient
for operations cannot be supplied.
(4) Initialization interface signals
Signal
MPOWER
POWERON
POWER
RSTSW#
RTCRST#
I/O
Function
O This signal indicates the VR4121 is operating. This signal is inactive during Hibernate mode.
O This signal indicates the VR4121 is ready to operate. It becomes active when a power-on factor is
detected and becomes inactive when the BATTINH/BATTINT# signal check operation is completed.
I This is a VR4121 activation signal.
I This is a VR4121 reset signal.
I This signal resets RTC. When power is first supplied to a device, the external agent must assert the
signal at this pin for about 2 s.
Data Sheet U14691EJ1V0DS00
11