T48C893 datasheet(16/82 Pages) ATMEL

16 / 82 page

T48C893

Rev. A4, 22-Jan-02

16 (82)

3.4.1

Voltage Monitor Control / Status Register

Primary register address: ’F’hex

Bit 3

Bit 2

Bit 1

Bit 0

VMC: Write

VM2

VM1

VM0

VIM

Reset value: 1111b

VMST: Read

–––

reserved

VMS

Reset value: xx11b

VM2: Voltage monitor Mode bit 2

VM1: Voltage monitor Mode bit 1

VM0: Voltage monitor Mode bit 0

VM2

VM1

VM0

Function

Disable voltage monitor

External (VIM-input), internal reference threshold (1.3 V), interrupt with negative slope

Not allowed

External (VMI-input), internal reference threshold (1.3 V), interrupt with positive slope

Internal (supply voltage), high threshold (3.0 V), interrupt with negative slope

Internal (supply voltage), middle threshold (2.6 V), interrupt with negative slope

Internal (supply voltage), low threshold (2.2 V), interrupt with negative slope

Not allowed

VIM Voltage Interrupt Mask bit

VIM = 0, voltage monitor interrupt is enabled

VIM = 1, voltage monitor interrupt is disabled

VMS Voltage Monitor Status bit

VMS = 0, the voltage at the comparator input is below Vref

VMS = 1, the voltage at the comparator input is above Vref

Low threshold

Middle threshold

High threshold

VMS = 1

Low threshold

Middle threshold

High threshold

VMS = 0

3.0 V

2.6 V

2.2 V

13755

Figure 12. Internal supply voltage supervisor

1.3 V

VMI

VMS = 1

VMS = 0

Positive slope

Negative slope

VMS = 1

VMS = 0

Interrupt negative slope

Interrupt positive slope

Internal reference level

13756

Figure 13. External input voltage supervisor

T48C893 Datasheet(PDF) 16 Page - ATMEL Corporation

T48C893 Datasheet(HTML) 16 Page - ATMEL Corporation

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