R8CSLASH2G datasheet(76/344 Pages) RENESAS

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R8C/2G Group

7. Comparator

Rev.1.00

Apr 04, 2008

Page 56 of 318

REJ09B0387-0100

7.4

Functional Description

Comparator 1 and comparator 2 operate independently.

The comparison result of the reference input voltage and analog input voltage can be read by software. The result

can also be output from the VCOUTi (i = 1 or 2) pin. An internal reference voltage or input voltage to the CVREF

pin can be selected as the reference input voltage. The comparator 1 interrupt or the comparator 2 interrupt also can

be used by selecting non-maskable or maskable for each interrupt.

7.4.1

Comparator 1

Table 7.3 lists the Procedure for Setting Bits Associated with Comparator 1 Interrupt, Figure 7.12 shows an

Operating Example of Comparator 1 (When Digital Filter Enabled), and Figure 7.13 shows an Operating

Example of Comparator 1 (When Digital Filter Disabled).

NOTE:

1. When the VW1C0 bit is set to 0, steps 6 and 7 can be executed at the same time (with one instruction)

Table 7.3

Procedure for Setting Bits Associated with Comparator 1 Interrupt

Step

When Using Digital Filter

When Not Using Digital Filter

Set the COMPSEL bit in the PINSR4 register to 1 (comparator 1, comparator 2)

Set the VCAB5 bit in the VCAB register to 1 (VCMP1 pin input voltage)

Set the VCA26 bit in the VCA2 register to 1 (comparator 1 circuit enabled)

Wait for td(E-A)

Select the interrupt type by the IRQ1SEL bit in the ALCMR register

Select the sampling clock by bits VW1F0

and VW1F1 in the VW1C register

Set the VW1C1 bit in the VW1C register to 1 (digital

filter disabled)

7(1)

Set the VW1C1 bit in the VW1C register

to 0 (digital filter enabled)

−

Select the interrupt request timing by the VCAC1 bit in the VCAC register and the VW1C7 bit in

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