pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 368

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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Host-Controlled Modules and Host Interface
RTC Control Register B (CRB)
Type: R/W
.
Bit
Name
Reset
Location: Index 0B
Bit
0
1
2
Daylight Savings. This bit is reset at V
0: Disabled
1: Enabled
Hour Mode. This bit is reset at V
0: 12-hour format enabled
1: 24-hour format enabled
Data Mode. This bit is reset at V
0: BCD format enabled
1: Binary format 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.
Set Mode
16
7
0
Rate Select
3 2 1 0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
Interrupt
Periodic
Enable
6
0
Table 67. Periodic Interrupt Rate Encoding
PP
Interrupt
PP
Enable
Alarm
Power-Up reset only.
Power-Up reset only.
5
0
PP
Power-Up reset only.
Periodic Interrupt
No interrupts
125.000000
250.000000
500.000000
Interrupt
15.625000
31.250000
62.500000
Rate (ms)
Update
3.906250
7.812500
0.122070
0.244141
0.488281
0.976562
1.953125
3.906250
7.812500
Enable
Ended
Description
368
4
0
(Continued)
Reserved
3
0
Data Mode Hour Mode
Divider Chain
2
0
Output
10
11
12
13
14
7
8
2
3
4
5
6
7
8
9
-
1
0
Daylight
Savings
Revision 1.07
0
0