R8C16 datasheet(32/279 Pages) RENESAS

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R8C/16 Group, R8C/17 Group

5. Reset

Rev.2.10

Jan 19, 2006

Page 19 of 254

REJ09B0169-0210

Reset

There are resets: hardware reset, power-on reset, voltage monitor 1 reset, voltage monitor 2 reset,

watchdog timer reset and software reset. Table 5.1 lists the Reset Name and Factor.

Figure 5.1

Block Diagram of Reset Circuit

Table 5.1

Reset Name and Factor

Reset Name

Factor

Hardware Reset

Input voltage of RESET pin is held “L”

Power-On Reset

VCC rises

Voltage Monitor 1 Reset

VCC falls (monitor voltage : Vdet1)

Voltage Monitor 2 Reset

VCC falls (monitor voltage : Vdet2)

Watchdog Timer Reset

Underflow of watchdog timer

Software Reset

Write “1” to PM03 bit in PM0 register

RESET

Power-On

Reset Circuit

Voltage

Detection

Circuit

Watchdog

Timer

CPU

Voltage Monitor 1 Reset

SFR

VCA26,

VW1C0 and

VW1C6 bits

SFR

VCA13, VCA27,

VW1C1, VW1C2,

VW1F0, VW1F1, VW1C7,

VW2C2 and VW2C3 bits

Pin, CPU and

SFR other than

above

VCC

Hardware Reset

Power-On Reset

Voltage Monitor 2 Reset

Watchdog Timer

Reset

Software Reset

VCA13 : Bit in VCA1 register

VCA26, VCA27 : Bits in VCA2 register

VW1C0 to VW1C2, VW1F0, VW1F1, VW1C6, VW1C7 : Bits in VW1C register

VW2C2, VW2C3 bits : Bits in VW2C register

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