161
Clock Generator
Chapter 4
Preliminary User’s Manual U17566EE1V2UM00
(4)
STBCTL- Stand-by control register
The 8-bit STBCTL register is used to control the stand-by function of the
voltage regulators.
Access
This register can be read/written in 8-bit or 1-bit units.
Writing to this register is protected by a special sequence of instructions.
Please refer to
“STBCTLP - Stand-by control protection register” on page 162
for details.
Address
FFFF FCA2
H
.
Initial Value
00
H
. The register is cleared by any reset.
In order to reduce the power consumption during power save modes the stand-
by function of the voltage regulators should be enabled during the initialization.
If a dedicated microcontroller does not include any of the voltage regulators
dedicated to the controls bit STBCTL.STBYCD andSTBCTL.STBYMD, the
status of the control bit has no function. Thus the initialization for enabling the
stand-by functions by STBCTL = 03
H
can be retained. For further details
concerning voltage regulators refer to
“Power Supply Scheme” on page 855
.
7
6
5
4
3
2
1
0
0
0
0
0
0
0
STYCD
STBYMD
R
R
R
R
R
R
R/W
R/W
Table 4-20
STBCTL register contents
Bit position
Bit name
Function
1
STBYCD
Enable stand-by function of VDD50 and VDD51 voltage regulators:
0: Stand-by function disabled
1: Stand-by function enabled
2
STBYMD
Enable stand-by function of VDD52 voltage regulator:
0: Stand-by function disabled
1: Stand-by function enabled
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