BAT32G1x9 user manual | Chapter 19 Universal serial communication unit
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19.4 Run stop mode
Each serial interface of a universal serial communication unit has a stop-run mode. Serial communication is
not possible in run-stop mode, so power consumption is reduced. In addition, pins for the serial interface can be
used as port functions in run-stop mode.
19.4.1
Case when the operation is stopped on a unit basis
The unit stop is set by peripheral allow register 0/2 (PER0/2).
Per0/2 registers are registers that are set to allow or disable clocks to each peripheral hardware. Reduce
power consumption and noise by stopping clocks to unused hardware.
To stop universal serial communication unit 0, the bit2 (SCI0EN) of PER0 must be set to "0"; To stop Universal
Serial Communication Unit 1, the bit3 (SCI1EN) of PER0 must be set to "0"; To stop Universal Serial Communication
Unit 2, bit3 (SCI2EN) of PER2 must be placed at "0"
。
Note 1
When the
SCImEN
bit is
"0"
, the write operation of the control register of
the universal serial communication
unit
m
is ignored
, and the read values are initial values. However, the following registers are excluded:
•Input Switch Control Register (ISC).
• Noise filter enable register
0
(NFEN0).
•Port Input Mode Register (PIM).
• Port Output Mode Register (POMx).
• Port Mode Register (PMx).
• Port register (Px).