PC87413 datasheet(149/257 Pages) NSC

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8.0 Real-Time Clock (RTC) (Continued)

Revision 1.2

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8.3

RTC REGISTERS

The RTC configuration registers can be accessed at any time during normal or standby operation; i.e., when VSB and/or VDD

are within the recommended operation range. Access to the RTC configuration registers is disabled during battery-backed

operation.

The register maps in this chapter use the following abbreviations for Type:

R/W

= Read/Write.

= Read from a speciﬁc register (write to the same address is to a different register).

= Write (see above).

= Read Only.

= Write Only. Reading from the bit returns 0.

R/W1C = Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect.

R/W1S = Read/Write 1 to Set. Writing 1 to a bit sets its value to 1. Writing 0 has no effect.

8.3.1

RTC Configuration Registers Structure

The RTC configuration registers can be accessed at any time during normal or standby operation; i.e., when VSB and/or VDD

are within the recommended operation range. Access to the RTC configuration registers is disabled during battery-backed

operation. See Section 3.16 on page 87 for a description of the Configuration registers.

Table 36. RTC Conﬁguration Register Map

Index

RTC Conﬁguration Register or Action

Type

Power Well

Reset

F0h

RAM Lock Register (RLR).

R/W1S

VSB

00h

F1h

Date-of-Month Alarm Register Offset (DOMAO).

R/W

VSB

00h

F2h

Month Alarm Register Offset (MONAO).

R/W

VSB

00h

F3h

Century Register Offset (CENO).

R/W

VSB

00h

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