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参数资料
| 型号： | M37150EFFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 8.95 MHz, MICROCONTROLLER, PDSO42 |
| 封装： | 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件页数： | 33/62页 |
| 文件大小： | 880K |
| 代理商： | M37150EFFP |
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36
MITSUBISHI MICROCOMPUTERS
M37702M2AXXXFP, M37702M2BXXXFP
M37702S1AFP, M37702S1BFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Fig. 46 Watchdog timer block diagram
WATCHDOG TIMER
The watchdog timer is used to detect unexpected execution se-
quence caused by software run-away.
Figure 46 shows a block diagram of the watchdog timer. The
watchdog timer consists of a 12-bit binary counter.
The watchdog timer counts the clock frequency divided by 32 (f32)
or by 512 (f512). Whether to count f32 or f512 is determined by the
watchdog timer frequency selection flag shown in Figure 47. f512
is selected when the flag is “0” and f32 is selected when it is “1”.
The flag is cleared after reset. FFF16 is set in the watchdog timer
______
when “L” or 2VCC is applied to the RESET pin, STP instruction is
executed, data is written to the watchdog timer, or the most signifi-
cant bit of the watchdog timer become “0”.
After FFF16 is set in the watchdog timer, the contents of watchdog
timer is decremented by one at every cycle of selected frequency
f32 or f512, and after 2048 counts, the most significant bit of watch-
dog timer become “0”, and a watchdog timer interrupt request bit
is set, and FFF16 is preset in the watchdog timer.
Normally, a program is written so that data is written in the watch-
dog timer before the most significant bit of the watchdog timer
become “0”. If this routine is not executed due to unexpected pro-
gram execution, the most significant bit of the watchdog timer
become eventually “0” and an interrupt is generated.
The processor can be reset by setting the bit 3 (software reset bit)
of processor mode register described in Figure 10 in the interrupt
section and generating a reset pulse.
______
The watchdog timer stops its function when the RESET pin volt-
age is raised to double the VCC voltage.
The watchdog timer can also be used to recover from when the
clock is stopped by the STP instruction. Refer to the section on
clock generation circuit for more details.
The watchdog timer hold the contents during a hold state and the
frequency is stopped to input.
Fig. 47 Watchdog timer frequency selection flag
Watchdog timer
frequency selection (connection forced to f 32 during
STP instruction execution)
Set “FFF16”
Write to watchdog
timer
detection
2Vcc
circuit
SQ
R
RESET
STP instruction
f512
f32
Watchdog timer
Hold
(6016)
0 : Select f512
1 : Select f32
7
6116
Address
Watchdog timer
frequency selection
6
5
4
3
2
1
0
相关PDF资料 |
PDF描述 |
|---|---|
| M37151M6-XXXFP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42 |
| M37151MC-XXXFP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42 |
| M37151M8-XXXFP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42 |
| M37207EF-XXXSP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP64 |
| M37207EF-XXXFP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M37150M6 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150M6-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150M8 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150M8-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150MA | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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