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Bit
Bit Name
13
12
STS4
11
STS3
10
STS2
9
STS1
8
STS0
Initial
Value
R/W
Description
0
R/W
Reserved
This bit is always read as 0. The write value should
always be 0.
0
R/W
Standby Timer Select 4 to 0
1
R/W
These bits select the time the MCU waits for the clock to
settle when software standby mode is cleared by an
1
R/W
external interrupt. With a crystal resonator, refer to table
1
R/W
18.2 and make a selection according to the operating
frequency so that the standby time is at least equal to the
1
R/W
oscillation settling time. With an external clock, a PLL
circuit settling time is necessary. Refer to table 18.2 to set
the standby time.
While oscillation is being settled, the timer is counted on
the Pφ clock frequency. Careful consideration is required
in multi-clock mode.
00000: Reserved
00001: Reserved
00010: Reserved
00011: Reserved
00100: Reserved
00101: Standby time = 64 states
00110: Standby time = 512 states
00111: Standby time = 1024 states
01000: Standby time = 2048 states
01001: Standby time = 4096 states
01010: Standby time = 16384 states
01011: Standby time = 32768 states
01100: Standby time = 65536 states
01101: Standby time = 131072 states
01110: Standby time = 262144 states
01111: Standby time = 524288 states
1XXXX: Reserved
Section 18 Power-Down States
Rev.2.00 Jun. 28, 2007 Page 567 of 666
REJ09B0311-0200
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