Sleep Timer Registers
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ST1 (0x96) – Sleep Timer 1
Bit Name Reset R/W Description
7:0
ST1[7:0]
0x00 R/W Sleep Timer count/compare value. When read, this register returns the middle bits [15:8] of the
Sleep Timer count. When writing, this register sets the middle bits [15:8] of the compare value. The
value read is latched at the time of reading register ST0. The value written is latched when ST0 is
written.
ST0 (0x95) – Sleep Timer 0
Bit Name Reset R/W Description
7:0
ST0[7:0]
0x00 R/W Sleep Timer count/compare value. When read, this register returns the low bits [7:0] of the Sleep
Timer count. When writing, this register sets the low bits [7:0] of the compare value. Writes to this
register are ignored unless STLOAD.LDRDY is 1.
STLOAD (0xAD) – Sleep Timer Load Status
Bit Name Reset R/W Description
7:1 – 0000 00 R0 Reserved
0
0
LDRDY
1 R Load ready. This bit is 0 while the Sleep Timer loads the 24-bit compare value and 1 when the
Sleep Timer is ready to start loading a new compare value.
STCC (0x62B0) – Sleep Timer Capture Control
Bit Name Reset R/W Description
7:5 – 000 R0 Reserved
4:3
PORT[1:0
11 R Port select. Valid settings are 0–2. Capture is disabled when set to 3, i.e. an invalid setting is
]
selected.
2:0
PIN[2:0]
111 Pin select. Valid settings are 0–7 when PORT[1:0] is 0 or 1, 0–5 when PORT[1:0] is 2. Capture is
disabled when an invalid setting is selected.
STCS (0x62B1) – Sleep Timer Capture Status
Bit Name Reset R/W Description
7:1 – 0000 00 R0 Reserved
0
0
VALID
0 R/W0 Capture valid flag. Set to 1 when capture value in STCV has been updated. Clear explicitly to allow
new capture.
STCV0 (0x62B2) – Sleep Timer Capture Value Byte 0
Bit Name Reset R/W Description
7:0
STCV[7:0
0x00 R Bits [7:0] of Sleep Timer capture value
]
STCV1 (0x62B3) – Sleep Timer Capture Value Byte 1
Bit Name Reset R/W Description
7:0
STCV[15:
0x00 R Bits [15:8] of Sleep Timer capture value
8]
STCV2 (0x62B4) – Sleep Timer Capture Value Byte 2
Bit Name Reset R/W Description
7:0
STCV[23:
0x00 R Bits [23:16] of Sleep Timer capture value
16]
136
Sleep Timer SWRU191C–April 2009–Revised January 2012
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