M37544G Mitsubishi Electric, M37544G Datasheet - Page 35

• Manufacturer Part Number: M37544G
• Description: Single-Chip 8-Bit CMOS Microcomputer
• Manufacturer: Mitsubishi Electric

The oscillation stop detection circuit is used for reset occurrence
when a ceramic resonator or an oscillation circuit stops by discon-
nection. When internal reset occurs, reset because of oscillation
stop can be detected by setting “1” to the oscillation stop detection
status bit.
Also, when using the oscillation stop detection circuit, a built-in
ring oscillator is required.
Figure 46 shows the state transition.
Note: The oscillation stop detection circuit is not included in the
Fig. 43 Structure of MISRG
Oscillation stop detection circuit (Note)
b7
emulator MCU “M37544RSS”.
b0
Oscillation stabilization time set bit after
release of the STP instruction
Ceramic / quartz-crystal or RC oscillation
stop detection function active bit
0: Detection function inactive
1: Detection function active
Reserved bits (return “0” when read)
(Do not write “1” to these bits)
Disable (return “0” when read)
Oscillation stop detection status bit
0: Oscillation stop not detected
1: Oscillation stop detected
0: Set “01
1: Not set automatically
MISRG(address 0038
in prescaler 1 automatically
16
” in timer1, and “FF
16
, initial value: 00
16
”
16
)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7544 Group
35