mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 443

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 16
Supply Voltage Sensor - (BATSV2)
16.1
The BATS module provides the functionality to measure the voltage of the battery supply pin VSENSE or
of the chip supply pin VSUP.
16.1.1
Either One of the voltage present on the VSENSE or VSUP pin can be routed via an internal divider to the
internal Analog to Digital Converter. Independent of the routing to the Analog to Digital Converter, it is
possible to route one of these voltages to a comparator to generate a low or a high voltage interrupt to alert
the MCU.
16.1.2
The BATS module behaves as follows in the system power modes:
Freescale Semiconductor
(Item No.)
Rev. No.
V01.00
V02.00
1. Run mode
2. Stop mode
The activation of the VSENSE Level Sense Enable (BSESE=1) or ADC connection Enable
(BSEAE=1) closes the path from the VSENSE pin through the resistor chain to ground and enables
the associated features if selected.
The activation of the VSUP Level Sense Enable (BSUSE=1) or ADC connection Enable
(BSUAE=1) closes the path from VSUP pin through the resistor chain to ground and enables the
associated features if selected.
BSESE takes precedence over BSUSE. BSEAE takes precedence over BSUAE.
During stop mode operation the path from the VSENSE pin through the resistor chain to ground is
opened and the low voltage sense features are disabled.
Introduction
15 Dec 2010
16 Mar 2010
Features
Modes of Operation
Data
MC9S12VR Family Reference Manual, Rev. 2.2
Preliminary - Subject to Change Without Notice
Table 16-1. Revision History Table
all
16.3.2.1
16.4.2.1
Sections
Affected
Initial Version
- added BVLS[1] to support four voltage level
- moved BVHS to register bit 6
Substantial Change(s)
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