HD404324FS datasheet(79/103 Pages) RENESAS

79 / 103 page

HD404054 Series/HD404094 Series

Compare Enable Register (CER: $018): Three-bit write-only register which enables comparator

operation, and selects the reference voltage and the analog input pin (figure 61).

Bit

Initial value

Read/Write

Bit name

CER3

—

Not used

CER0

CER1

Compare enable register (CER: $018)

CER3

Digital/Analog selection

Digital input mode:

RD /COMP0, RD /COMP1

operate as R port

Analog input mode:

RD /COMP0, RD /COMP1

operate as analog input

CER1

Analog input pin selection

COMP0

COMP1

Not used

CER0

Figure 61 Compare Enable Register

Compare Data Register (CDR: $017): Two-bit read-only register which latches the result of the

comparison between the analog input pins and the reference voltage. Bits 0 and 1 corresponds the results

of comparison with COMP

0 and COMP1, respectively.

This register can be read only by the TM or TMD

command. Only bit CER3 corresponds to the analog input pin which the input pin selection is made

through pins CER0 and CER1. After a compare operation, the data in this register is not retained (figure

62).

Bit

Initial value

Read/Write

Bit name

—

Not used

—

Not used

CDR0

CDR1

Compare data register (CDR: $017)

Undefined Undefined

Result of COMP0 comparison

Result of COMP1 comparison

Figure 62 Compare Data Register

Note on Use: During the compare operation pins RD

0/COMP0 and RD1/COMP1 operate as analog inputs

and cannot operate as R ports.

The comparator can operate in active mode but is disabled in other modes.

0/VCref cannot operate as an R port when the external input voltage is selected as the reference.

HD404324FS датащи(PDF) 79 Page - Renesas Technology Corp

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