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参数资料
| 型号： | M37920F8CGP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件页数： | 6/155页 |
| 文件大小： | 1274K |
| 代理商： | M37920F8CGP |
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103
M37920F8CGP, M37920F8CHP, M37920FCCGP
M37920FCCHP, M37920FGCGP, M37920FGCHP
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
MITSUBISHI MICROCOMPUTERS
Watchdog timer
frequency select bit
Writing to watchdog timer register
Watchdog timer
“FFF16” is set.
1/16
Wf32
Wf512
f2
HLDA
Wait mode
DMA transfer
Watchdog timer
interrupt request
Access to external area
RESET
STP instruction
1
0
g
1
0
External clock input select bit
Watchdog timer register : address 6016
Watchdog timer frequency select register : bit 0 at address 6116
g When the most significant bit of the watchdog timer becomes “0”, this signal will be generated.
At the STP instruction execution,
however, Wf32 is selected
compulsorily.
Disables watchdog timer
WATCHDOG TIMER
The watchdog timer is used to detect unexpected execution se-
quence caused by software runaway and others. Figure 100 shows
the block diagram of the watchdog timer.
The watchdog timer consists of a 12-bit binary counter.
The watchdog timer counts clock Wf32, which is obtained by dividing
the peripheral devices’ clock f2 by 16; or clock Wf512, which is ob-
tained by doing it by 256. The watchdog timer frequency select reg-
ister (bit 0 = watchdog timer frequency select bit) shown in Figure
101 selects which clock is to be counted.
Wf512 is selected when this bit 0 is “0”, and Wf32 is selected when
this bit 0 is “1”. This bit 0 is cleared to “0” after reset.
FFF16 is set in the watchdog timer when “L” level voltage is applied
to pin RESET, STP instruction is executed, data is written to the
watchdog timer register (address 6016), or the most significant bit of
the watchdog timer becomes “0”.
After FFF16 is set in the watchdog timer, when the watchdog timer
counts Wf32 or Wf512 by 2048 counts, the most significant bit of
watchdog timer becomes “0”, the watchdog timer interrupt request
bit is set to “1”, and FFF16 is set again in the watchdog timer.
In program coding, make sure that data is written in the watchdog
timer before the most significant bit of the watchdog timer becomes
“0”. If this routine is not executed owing to unexpected program ex-
ecution or others, the most significant bit of the watchdog timer be-
Fig. 100 Watchdog timer’s block diagram
Fig. 101 Watchdog timer frequency select register’s bit configuration
76543210
Watchdog timer frequency select register
Watchdog timer frequency select bit
0 : W f512 is selected.
1 : W f32 is selected.
76543210
Address
6116
comes “0” and an interrupt is generated.
The microcomputer can generate a reset pulse by writing “1” to bit 6
(software reset bit) of processor mode register 0 in an interrupt rou-
tine and can be restarted.
The watchdog timer can also be used to return from the STP state,
where a clock has stopped its operation owing to the STP instruction
execution. For details, refer to the sections on the clock generating
circuit.
The watchdog timer stops its operation in the following cases, and at
this time, input to the watchdog timer is disabled:
When the external area is accessed in the hold state
In the wait mode
In the stop mode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37920FCCGP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FCCHP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FGCGP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FGCHP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920S4CGP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER |
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