Renesas MCU Board for 4513/4514 Group MCUs M34514T-MCU Instrukcja Użytkownika Pobierz pdf (Strona 29)

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5. Precautions to Be Taken When Debugging

5.1 Reset

The M34514T-MCU uses a 74AC14 for its RESET signal input buffer, so that its electrical

characteristics differ from those of the actual chip. Table 5.1 lists the RESET signal input

characteristics of the M34514T-MCU.

Table 5.1 RESET signal input characteristics

5.2 System Clock

Depending on the supply voltage and operation mode, use one of the following frequencies for the

system clock:

• Supply voltage 5 V: 4.2 MHz or less (medium-speed/high-speed mode)

• Supply voltage 3 V: 4.2 MHz or less (medium-speed mode), 2.0 MHz or less (high-speed mode)

To change this clock frequency to suit that of the target system, attach the necessary parts to the

oscillator circuit board OSC-2 that are included with the M34514T-MCU package.

For details about the oscillation circuit constant, consult your oscillator manufacturer.

5.3 Real-time Capability of Timer

The PC4504 and M34514T-MCU have their internal clock operating even during emulation, so that

the timer values keep changing.

Example: (1) When single-stepping the program

(2) When registers or internal RAM are referenced or modified

H-level threshold voltage

L-level threshold voltage

Hysteresis voltage

Item Symbol

Voltage

VCC = 3.0 V

VCC = 4.5 V

VCC = 5.5 V

VCC = 3.0 V

VCC = 4.5 V

VCC = 5.5 V

VCC = 3.0 V

VCC = 4.5 V

VCC = 5.5 V

Maximum

2.2 V

3.2 V

3.9 V

1.2 V

1.4 V

1.6 V

Minimum

0.5 V

0.9 V

1.1 V

0.3 V

0.4 V

0.5 V

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