PC87591L datasheet(368/437 Pages) NSC

368 / 437 page

Host-Controlled Modules and Host Interface (Continued)

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368

Revision 1.07

RTC Control Register B (CRB)

Location: Index 0B16

Type: R/W

Table 67. Periodic Interrupt Rate Encoding

Rate Select

3210

Periodic Interrupt

Rate (ms)

Divider Chain

Output

0 0 0 0

No interrupts

0 0 0 1

3.906250

0 0 1 0

7.812500

0 0 1 1

0.122070

0 1 0 0

0.244141

0 1 0 1

0.488281

0 1 1 0

0.976562

0 1 1 1

1.953125

1 0 0 0

3.906250

1 0 0 1

7.812500

1 0 1 0

15.625000

1 0 1 1

31.250000

1 1 0 0

62.500000

1 1 0 1

125.000000

1 1 1 0

250.000000

1 1 1 1

500.000000

Bit

76543210

Name

Set Mode

Periodic

Interrupt

Enable

Alarm

Interrupt

Enable

Update

Ended

Interrupt

Enable

Reserved

Data Mode Hour Mode

Daylight

Savings

Reset

00000000

Bit

Description

Daylight Savings. This bit is reset at VPP Power-Up reset only.

0: Disabled

1: Enabled

In the spring, time advances from 1:59:59 AM to 3:00:00 AM on the first Sunday in April.

In the fall, time returns from 1:59:59 AM to 1:00:00 AM on the last Sunday in October.

Hour Mode. This bit is reset at VPP Power-Up reset only.

0: 12-hour format enabled

1: 24-hour format enabled

Data Mode. This bit is reset at VPP Power-Up reset only.

0: BCD format enabled

1: Binary format enabled

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