PC87591L datasheet(353/437 Pages) NSC

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6.0 Host-Controlled Modules and Host Interface (Continued)

Revision 1.07

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6.1.12 Real Time Clock (RTC) Configuration

Logical Device 16 (1016) RTC Conﬁguration

Table 62 lists the configuration registers that affect the RTC. See Section 6.1.1 on page 335 and Section 6.1.2 on page 340

for descriptions of the other configuration registers.

Table 62. RTC Conﬁguration Registers

RAM Lock Register (RLR)

When a non-reserved bit is set to 1, it can be cleared only by host domain hardware reset.

Location: Index F016

Type: R/W

Index

RTC Conﬁguration Register or Action

Type

Reset

3016

Activate. When bit 0 is cleared, the registers of this logical device are not

accessible.

R/W

0016

6016

Base Address MSB register.

R/W

0016

6116

Base Address LSB register. Bit 0 (for A0) is read only, ‘0’.

R/W

7016

6216

Base Address MSB register.

R/W

0016

6316

Base Address LSB register. Bit 0 (for A0) is read only, ‘0’.

R/W

7216

7016

RTC Interrupt Number and Wake-Up on IRQ Enable register.

R/W

0816

7116

RTC Interrupt Type. Bit 1 is read/write; other bits are read only.

R/W

0016

7416

Report no DMA assignment.

0416

7516

Report no DMA assignment.

0416

F016

RAM Lock Register (RLR)

R/W

0016

F116

Date of Month Alarm Register Offset (DOMAO)

R/W

0016

F216

Month Alarm Register Offset (MONAO)

R/W

0016

F316

Century Register Offset (CENO)

R/W

0016

Bit

76543210

Name

Block

Standard

RAM

Block RAM

Write

Block

Extended

RAM Write

Block

Extended

RAM Read

Block

Extended

RAM

Reserved

Reset

00000000

Bit

Description

2-0

Reserved.

Block Extended RAM. Controls access to the Extended RAM 128 bytes.

0: No effect on Extended RAM access (default)

1: Reads and writes to the Extended RAM are blocked, writes are ignored and reads return FF16

Block Extended RAM Read. Controls read from bytes 0016-1F16 of the Extended RAM.

0: No effect on Extended RAM access (default)

1: Reads to bytes 0016-1F16 of the Extended RAM are ignored; reads return FF16

Block Extended RAM Write. Controls writes to bytes 0016-1F16 of the Extended RAM.

0: No effect on the Extended RAM access (default)

1: Writes to bytes 0016-1F16 of the Extended RAM are ignored

PC87591L Datasheet(PDF) 353 Page - National Semiconductor (TI)

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