Register For Low Voltage And Cpu Operation Detection Reset Circuit; Fig. 24.2 Low Voltage And Cpu Operation Detection Reset Control Register (Lvrc) - Fujitsu MB90420/5 (A) Series Hardware Manual

LOW VOLTAGE AND CPU OPERATION DETECTION RESET CIRCUIT

24.3 Register for Low Voltage and CPU Operation Detection Reset Circuit

The detection reset control register for low voltage and CPU operation (LVRC) clears the detection reset
flags for low voltage and CPU operation, the CPU operation detection circuit counter, etc.
n Detection reset control register for low voltage and CPU operation (LVRC)
bit 7
Address
006E
RESV0 RESV0 RESV1 RESV1
H
R/W R/W R/W R/W
R/W : Both read and write
– : Unused
X : Undefined
: Initial value

Fig. 24.2 Low Voltage and CPU Operation Detection Reset Control Register (LVRC)

bit 6 bit 5 bit 4 bit 3
CL
W
CPUF
0
1
LBRF
0
1
CL
0
1
RESV1
Always write 1 to this bit.
RESV0
Always write 0 to this bit.
bit 2 bit 1 bit 0
Initial value
00111000
LVRF CPUF
RESV0
R/W R/W R/W
CPU Operation Detection Flag Bit
At Read
Indicates no overflow occurs
Indicates overflow occurs
Low-voltage Detection Flag Bit
At Read
Indicates no voltage drop
detected
Indicates voltage drop
detected
CPU Operation Detection Clear Bit
Clears counter
Does not affect this bit or other bits
24-5
B
At Write
Clears this bit
Does not affect this bit or
other bits
At Write
Clears this bit
Does not affect this bit or
other bits
Reserved Bit
Reserved Bit