D17133CS datasheet(148/289 Pages) NEC

148 / 289 page

CHAPTER 13

PERIPHERAL HARDWARE

133

Figure 13-9. Comparator Input Channel Selection Register

RF: 1CH

Read/write

Initial value when reset

Bit 3

Bit 2

Bit 1

CMPCH1

Bit 0

CMPCH0

R/W

Read=R, write=W

CMPCH1

Comparator Input Channel Selection

Select Cin0

Select Cin1

Select Cin2

Select Cin3

CMPCH0

Figure 13-10. Reference Voltage Selection Register

RF: 1DH

Read/write

Initial value when reset

Bit 3

CMPVREF3

Bit 2

CMPVREF2

Bit 1

CMPVREF1

Bit 0

CMPVREF0

R/W

Read=R, write=W

Selected Reference Voltage

Voltage applied to Vref pin

1/16 VDD

2/16 VDD (1/8 VDD)

3/16 VDD

4/16 VDD (1/4 VDD)

5/16 VDD

6/16 VDD (3/8 VDD)

7/16 VDD

8/16 VDD (1/2 VDD)

9/16 VDD

10/16 VDD (5/8 VDD)

11/16 VDD

12/16 VDD (3/4 VDD)

13/16 VDD

14/16 VDD (7/8 VDD)

15/16 VDD

CMPVREF2

CMPVREF3

CMPVREF1

CMPVREF0

Caution

When CMPSTRT =1, a write instruction to

this register is ignored (the data in the

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