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MC9S12VR-Family - Data Sheet - Freescale Semiconductor

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Supply Voltage Sensor - (BATSV2)<br />

During stop mode operation the path from the VSUP pin through the resistor chain to ground is<br />

opened and the low voltage sense features are disabled.<br />

The content of the configuration register is unchanged.<br />

16.1.3 Block Diagram<br />

Figure 16-1 shows a block diagram of the BATS module. See device guide for connectivity to ADC<br />

channel.<br />

BVLS[1:0]<br />

BVHS<br />

16.2 External Signal Description<br />

Figure 16-1. BATS Block Diagram<br />

This section lists the name and description of all external ports.<br />

16.2.1 VSENSE — Supply (Battery) Voltage Sense Pin<br />

...<br />

VSENSE<br />

BVLC BVHC<br />

Comparator<br />

BSEAE BSUAE<br />

This pin can be connected to the supply (Battery) line for voltage measurements. The voltage present at<br />

this input is scaled down by an internal voltage divider, and can be routed to the internal ADC or to a<br />

<strong>MC9S12VR</strong> <strong>Family</strong> Reference Manual, Rev. 2.8<br />

VSUP<br />

to ADC<br />

442 <strong>Freescale</strong> <strong>Semiconductor</strong><br />

...<br />

BSESE BSUSE<br />

1 automatically closed if BSESE and/or BSEAE<br />

is active, open during Stop mode<br />

2 automatically closed if BSUSE and/or BSUAE<br />

is active, open during Stop mode<br />

1 2

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