SH3100 Datasheet, PDF (22/80 Pages) Semtech Corporation – Supervisory IC with I2C Interface and PWM

SH3100
POWER MANAGEMENT
Register Descriptions (continued)
Address(hex): 03
Register Name WakeupTime
Bit 7
Bit No.
[7:0]
Bit 6
Bit 5
Description
WakeupTime
Bits [7:0] of the 4-byte
WakeupTime
Description
Bit 4
Bit Value
00 (hex)
(RW) Least Significant Byte of Default Value: 0000 0000
WakeupTime.
Reset Event: P
Bit 3
Bit 2
Bit 1
Bit 0
Value Description
The least significant byte of WakeupTime.
Writing to this register loads all four bytes of WakeupTime into
the PIT after up to two periods of the 32.768 kHz clock, i.e.
61 μs later. It is important that no writes or reads to either
WakeupTime, RTC, PeriodicTimer nor DCOCode occur during
this period. The PeriodicTimer is reset whenever this register is
written
When reading WakeupTime, this must be the first of the four
bytes to be read
Address(hex): 06
Register Name PeriodicTimer
Bit 7
Bit No.
[7:0]
Bit 6
Bit 5
Description
PeriodicTimer
Bits [31:23] of the 4 byte
PeriodicTimer
Description
Bit 4
Bit Value
00 (hex)
(RO) Most Significant Byte of
PeriodicTimer.
Default Value: 0000 0000
Reset Event: P, W, B
Bit 3
Bit 2
Bit 1
Bit 0
Value Description
The most significant byte of PeriodicTimer, which repetitively
increments from 0 up to WakeupTime, clocked by the
32.768 kHz clock (Xtal if stable, internal 32.768 kHz oscillator
otherwise). When reading PeriodicTimer, the least significant
byte should read first
The PeriodicTimer is disabled if WakeupTime is zero
Address(hex): 07
Register Name PeriodicTimer
Description
Bit 7
Bit No.
[7:0]
Bit 6
Bit 5
Bit 4
Description
PeriodicTimer
Bits [23:16] of the 4 byte PeriodicTimer
(RO) Bits [23:16] of
PeriodicTimer.
Default Value: 0000 0000
Reset Event: P, W, B
Bit 3
Bit 2
Bit 1
Bit 0
Bit Value Value Description
00 (hex) See register 06 description
Address(hex): 08
Register Name PeriodicTimer
Description
Bit 7
Bit No.
[7:0]
Bit 6
Bit 5
Bit 4
Description
PeriodicTimer
Bits [15:8] of the 4 byte PeriodicTimer
(RO) Bits [15:8] of
PeriodicTimer.
Default Value: 0000 0000
Reset Event: P, W, B
Bit 3
Bit 2
Bit 1
Bit 0
Bit Value Value Description
00 (hex) See register 06 description
© 2006 Semtech Corp.
22
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