Renesas Single-Chip Microcomputer M34519T-MCU Informations techniques télécharger pdf (Page 25)

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4.2 Watchdog Timer

The M34519T-MCU does not have an operational watchdog timer. Therefore, use an evaluation

MCU (OTP version) to verify the operation associated with a watchdog timer.

The M34519T-MCU outputs a signal whose waveform is shown below from check pin TP5 during

WRST instruction execution cycles. This signal allows you to check the initialization cycle of a

watchdog timer.

System clock

XIN

CNVSS

WRST

Figure 4.1 Waveform output from check pin TP5

Chapter 4. Precautions to Be Taken for Debugging a Program

4.1 Reset

The M34519T-MCU uses a 74HC14 for its RESET signal input buffer, so that its electrical

characteristics differ from those of an actual MCU. Table 4.1 lists the RESET signal input

characteristics of the M34519T-MCU.

Table 4.1 RESET signal input characteristics

H-level threshold voltage

L-level threshold voltage

Hysteresis voltage

Item Symbol

Voltage

VCC = 2.0 V

VCC = 4.5 V

VCC = 6.0 V

VCC = 2.0 V

VCC = 4.5 V

VCC = 6.0 V

VCC = 2.0 V

VCC = 4.5 V

VCC = 6.0 V

Max.

1.5 V

3.15 V

4.2 V

0.9 V

2.0 V

2.6 V

1.0 V

1.4 V

1.7 V

Min.

1.0 V

2.3 V

3.0 V

0.3 V

1.13 V

1.5 V

0.3 V

0.6 V

0.8 V

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