SH3100 Datasheet, PDF (23/80 Pages) Semtech Corporation – Supervisory IC with I2C Interface and PWM

SH3100
POWER MANAGEMENT
Register Descriptions (continued)
Address(hex): 09
Register Name PeriodicTimer
Description
Bit 7
Bit No.
[7:0]
Bit 6
Bit 5
Bit 4
Description
PeriodicTimer
Bits [7:0] of the 4 byte PeriodicTimer
(RO) Bits [7:0] of PeriodicTimer. Default Value: 0000 0000
Reset Event: P, W, B
Bit 3
Bit Value
00 (hex)
Bit 2
Bit 1
Value Description
See register 06 description
Bit 0
Address(hex): 0B
Register Name RTC
Bit 7
Bit No.
[7:4]
[3:0]
Bit 6
Bit 5
Year (MSD)
Description
Year (MSD)
Year (LSD)
Description
Bit 4
Bit Value
00 (hex)
03 (hex)
(R/W) Real Time Clock.
Default Value: 0000 0011
Reset Event: P
Bit 3
Bit 2
Bit 1
Bit 0
Value Description
Year (LSD)
Upper digit of the Binary Coded Decimal (BCD) year count
Lower digit of the BCD year count. Years cycle 00 (BCD) to 99
(BCD)
RTC runs continuously after startup, even through brownouts
and watchdog resets
When writing the RTC, all bytes must be written, and LSB
(address 11) must be written last
When reading the RTC, the LSB must be read first
Address(hex): 0C
Register Name RTC
Bit 7
Bit 6
Bit No.
[4]
[3:0]
Description
Month (MSD)
Month (LSD)
Bit 5
Description
Bit 4
(R/W) Real Time Clock.
Bit 3
Bit 2
Default Value: 0000 0001
Reset Event: P
Bit 1
Bit 0
Month (MSD)
Month (LSD)
Bit Value Value Description
00 (hex)
03 (hex)
Upper digit of the Binary Coded Decimal (BCD)month count
Lower digit of the BCD month count. Month counter cycles from
01 (BCD) to 12 (BCD)
See also 0B description
© 2006 Semtech Corp.
23
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