M30622 Mitsubishi, M30622 Datasheet - Page 71

• Manufacturer Part Number: M30622
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: Mitsubishi

Watchdog Timer
Cold start / Warm start
Figure 1.15.2. Watchdog timer control and start registers
Figure 1.15.3. Cold sgtart / Warm start
The cold start/warm start discrimination flag(bit 5 at 000F
or by reset signal(warm start).
The cold start/warm start discrimination flag is set ‘‘0’’ at power on, and is set ‘‘1’’ at writing any data to the
watchdog timer control register(address is 000F
input of reset signal.
Tentative Specifications REV.A
Cold start / Warm start
discrimination flag (WDC5)
Watchdog timer control register
b7
b7
Watchdog timer start register
S
pecifications in this manual are tentative and subject to change.
b6
0
b5
0
b4
RESET
Vcc
b3
b2
b1
‘‘5V’’
‘‘0V’’
‘‘5V’’
‘‘0V’’
‘‘1’’
‘‘0’’
b0
b0
Note 1: When this flag is written ‘‘0’’ or ‘‘1’’, it is set ‘‘1’’ automatically .
The watchdog timer is initialized and starts counting after a write instruction to
this register. The watchdog timer value is always initialized to “7FFF
regardless of whatever value is written.
Bit symbol
WDV5
High-order bit of watchdog timer
Reserved bit
WDC7
: This bit is not under the influence of a reset.
Symbol
WDC
Symbol
WDTS
Cold start / warm start
discrimination flag (Note 1)
Prescaler select bit
0.2Vcc
Set to ‘‘1’’ by software
16
Bit name
). The flag is not set to ‘‘0’’ by the software reset and the
71
Address
000F
Address
000E
16
16
16
Function
) indicates the last reset by power on(cold start)
Indeterminate
When reset
00 XXXXX
0 : Cold start
1 : Warm start
Must always be set to “0”
0 : Divided by 16
1 : Divided by 128
When reset
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
2
Function
Mitsubishi microcomputers
16
M16C / 62T Group
”
R
R
W
W