R8C2H datasheet(60/67 Pages) RENESAS

60 / 67 page

R8C/2H Group, R8C/2J Group

6. Voltage Detection Circuit

Rev.1.00

Mar 28, 2008

Page 40 of 341

REJ09B0388-0100

Figure 6.1

Block Diagram of Voltage Detection Circuit

Figure 6.2

Block Diagram of Voltage Monitor 0 Reset Generation Circuit

VCA25

≥ Vdet2

Internal

reference

voltage

VCA27

VCA26

VCC

Voltage detection 1

signal

VCA13 bit

Voltage detection 2

signal

Voltage detection 0 signal

≥ Vdet1

≥ Vdet0

VCA1 register

VW1C3 bit

VW1C register

Noise

filter

Noise

filter

VCMP2

VCAB6 = 1

VCAB6 = 0

VCMP1

VCAB5 = 1

VCAB5 = 0

VCA13: Bit in VCA1 register

VCA25, VCA26, VCA27: Bits in VCA2 register

VW1C3: Bit in VW1C register

VCAB5, VCAB6: Bits in VCAB register

Shared with comparator

1/2

Voltage detection 0 circuit

VCA25

VCC

Internal

reference

voltage

Voltage detection 0

signal is held “H” when

VCA25 bit is set to 0

(disabled)

Voltage

detection 0

signal

fOCO-S

VW0F1 to VW0F0

= 00b

= 01b

= 10b

= 11b

VW0C7

Voltage monitor 0

reset signal

Voltage monitor 0 reset generation circuit

VW0C0 to VW0C1, VW0F0 to VW0F1, VW0C6, VW0C7: Bits in VW0C register

VCA25: Bit in VCA2 register

VW0C0

VW0C6

VW0C1

Digital

filter

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