T48C893 Datasheet, PDF (16/82 Pages) ATMEL Corporation – The multiple times programmable (MTP) version for the MARC4 ROM types

T48C893
3.4.1 Voltage Monitor Control / Status Register
Primary register address: ’F’hex
ÁÁÁÁVVÁÁÁÁMMCSÁÁÁÁT::WRÁÁÁÁreiateÁÁÁÁd ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVB–Mi–ÁÁÁÁt–32 ÁÁÁÁÁÁÁÁVB–ÁÁÁÁMi–t–21ÁÁÁÁÁÁÁÁreVBÁÁÁÁseMirtv1ÁÁÁÁ0ed ÁÁÁÁÁÁÁÁVVBMiItMÁÁÁÁ0S ÁÁÁÁÁÁÁÁÁÁÁÁRRÁÁÁÁeesseettÁÁÁÁvvaaÁÁÁÁlluuee::ÁÁÁÁx11x11ÁÁÁÁ11bbÁÁÁÁÁÁÁÁ
VM2: Voltage monitor Mode bit 2
VM1: Voltage monitor Mode bit 1
VM0: Voltage monitor Mode bit 0
VM2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
VM1
1
1
0
0
1
1
0
0
VM0
1
0
1
0
1
0
1
0
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
VMS = 1
VDD
Low threshold
Middle threshold
High threshold
3.0 V
2.6 V
2.2 V
Low threshold
Middle threshold VMS = 0
High threshold
13755
Figure 12. Internal supply voltage supervisor
VMI
1.3 V
Negative slope
VMS = 1
Internal reference level
Interrupt positive slope
VMS = 1
VMS = 0
VMS = 0
Positive slope
Interrupt negative slope
Figure 13. External input voltage supervisor
t
13756
16 (82)
Rev. A4, 22-Jan-02