参数资料
型号: M44C892
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封装: SSO-20
文件页数: 7/84页
文件大小: 643K
代理商: M44C892
M44C892
M44C892
M44C092
Rev. A5, 14-Dec-01
15 (84)
2.4.1
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
1
1
1
Disable voltage monitor
1
1
0
External (VIM-input), internal reference threshold (1.3 V), interrupt with negative slope
1
0
1
Not allowed
1
0
0
External (VMI-input), internal reference threshold (1.3 V), interrupt with positive slope
0
1
1
Internal (supply voltage), high threshold (3.0 V), interrupt with negative slope
0
1
0
Internal (supply voltage), middle threshold (2.6 V), interrupt with negative slope
0
0
1
Internal (supply voltage), low threshold (2.2 V), interrupt with negative slope
0
0
0
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
V
DD
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
t
13756
Figure 13. External input voltage supervisor
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