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2.6 Voltage comparator

2-54

4513/4514 Group User’s Manual

2.6 Voltage comparator

The 4513/4514 Group has two voltage comparators; CMP0-, CMP0+, CMP1-, CMP1+.

This section describes the voltage comparator function, related registers, and notes.

2.6.1 Voltage comparator function

(1)

CMP0

s Voltage comparison

The voltage of CMP0- is compared with that of CMP0+, and the result is stored into bit 0 of the

voltage comparator control register Q3.

(2)

CMP1

s Voltage comparison

The voltage of CMP1- is compared with that of CMP1+, and the result is stored into bit 1 of the

voltage comparator control register Q3.

2.6.2 Related registers

(1)

Voltage comparator control register Q3

The voltage comparator (CMP1) control bit is assigned to bit 3, the voltage comparator (CMP0)

control bit is assigned to bit 2, the CMP1 comparison result store bit is assigned to bit 1 and the

CMP0 comparison result store bit is assigned to bit 0.

Set the contents of this register through register A with the TQ3A instruction. The TAQ3 instruction

can be used to transfer the contents of register Q3 to register A.

Table 2.6.1 shows the voltage comparator control register Q3.

Table 2.6.1 Voltage comparator control register Q3

Voltage comparator control register Q3

(Note 2)

at reset : 00002

at RAM back-up : state retained

R/W

Voltage comparator (CMP1)

control bit

Voltage comparator (CMP0)

control bit

CMP1 comparison result store bit

CMP0 comparison reslut store bit

Q33

Q32

Q31

Q30

Notes 1: “R” represents read enabled, and “W” represents write enabled.

2: Bits 0 and 1 of register Q3 can be only read.

Voltage comparator (CMP1) invalid

Voltage comparator (CMP1) valid

Voltage comparator (CMP0) invalid

Voltage comparator (CMP0) valid

CMP1- > CMP1+

CMP1- < CMP1+

CMP0- > CMP0+

CMP0- < CMP0+

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