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CHAPTER 6 PIN FUNCTIONS
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6.1.3 Battery Monitor Interface Signals
The battery monitor interface signals are used by the external circuitry to indicate whether the power
required to enable system operation is being supplied. Table 6-3 indicates the functions of the battery
monitor interface signals.
Table 6-3. Battery Monitor Interface Signals
Signal name
I/O
Definition
Function
BATTINH
I
Battery Inhibit
Interrupt signal for indicating low battery charge at power-on. The
external circuitry checks the battery charge level at power-on, and
asserts this pin when it is confirmed that the battery voltage is
sufficient to enable operation.
BATTINT*
I
Battery Interrupt
Interrupt signal for indicating an insufficient battery charge level
during normal operation. The external circuitry monitors the battery
charge level, and asserts this pin when it is confirmed that the
battery charge has fallen to a level where the voltage required for
operation is longer being supplied.
6.1.4 Initialization Interface Signals
The initialization interface signals are used when an external circuit initializes the processor operating
parameters. Table 6-4 lists the functions of these signals.
Table 6-4. Initialization Interface Signals
Signal name
I/O
Definition
Function
MPOWER
O
Main Power On
Signal for turning on the main power. By asserting this pin, the
V
R
4101 turns on the power to the external DC/DC converter.
POWERON
O
Power On State
Signal for indicating that the V
R
4101 is being activated in Hibernate
mode. This signal becomes active upon the detection of an
activation factor. It subsequently becomes inactive upon the
completion of battery checking.
POWER
I
Power On Switch
Signal for indicating that the power-on switch has been pressed.
When the power-on switch is pressed, the external circuitry asserts
this pin.
RSTSW*
I
Reset Switch
Signal for indicating that the reset switch has been pressed. When
the reset switch is pressed, the external circuitry asserts this pin.
RTCRST*
I
Real-time Clock Reset
Signal for resetting RTC. When the power to the device is turned on
for the first time, the external circuitry asserts this pin for about 230
ms.