M32C83T datasheet(67/527 Pages) RENESAS

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Page 44

5. Reset

)

(

RESET

VCC

0.2VCC or below

RESET

VCC

Recommended

Operation Voltage

The above applies to VCC = 5V

Supply a clock with 20 or more cycles to

the XIN pin

5. Reset

Hardware reset, software reset, and watchdog timer reset are available to reset the microcomputer.

5.1 Hardware Reset

5.1.1 Reset on a Stable Supply Voltage

The microcomputer resets pins, the CPU and SFR when the supply voltage meets the recommended

___________

performance conditions while an "L" signal is applied to the RESET pin (see Table 5.1). Apply an "H"

____________

signal to the RESET pin again after 20 or more clock cycles are input to the XIN pin while applying an "L"

____________

to the RESET pin. The CPU and SFR are reset and programs run from the address indicated by the reset

vector.

____________

The internal RAM is not reset. When the RESET pin becomes "L" while writing data to the internal RAM,

the internal RAM is in an indeterminate state.

5.1.2 Power-on Reset

The microcomputer resets pins, the CPU and SFR when the supply voltage applied to the VCC pin meets

___________

the recommended performance conditions while an "L" signal is applied to the RESET pin. (See Table

5.1.)

____________

The CPU and SFR are reset when the signal applied to the RESET pin changes low ("L") to high ("H")

after the main clock oscillation stabilizes and 20 or more clock cycles are applied to the XIN pin. Programs

run from the address indicated by the reset vector. The internal RAM is in a indeterminate state

Figure 5.1 shows a reset circuit. Figure 5.2 shows a reset sequence. Figure 5.3 shows CPU register condi-

____________

tions after reset. Table 5.1 lists pin states while the RESET pin is held "L". Refer to 4. SFR for SFR states

after reset.

Figure 5.1 Reset Circuit

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