Toshiba TLCS-870/C1 Series, Manual

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TMP89FM42
RA001
10. Low Power Consumption Function for Peripherals
The TMP89FM42 has low power consumption registers (POFFCRn) that save power when specific peripheral
functions are unused. Each bit of the low power consumption registers can be set to enable or disable each peripheral
function. (n = 0, 1, 2, 3)
The basic clock supply to each peripheral function is disabled for power saving, by setting the corresponding bit of
the low power consumption registers (POFFCRn) to "0". (The disabled peripheral functions become unavailable.)
The basic clock supply to each peripheral function is enabled and the function becomes available by setting the cor-
responding bit of the low power consumption registers (POFFCRn) to "1".
After reset, the low power consumption registers (POFFCRn) are initialized to "0", and thus the peripheral func-
tions are unavailable. When each peripheral function is used for the first time, be sure to set the corresponding bit of
the low power consumption registers (POFFCRn) to "1" in the initial settings of the program (before operating the
control register for the peripheral function).
When a peripheral function is operating, the corresponding bit of the low power consumption registers
(POFFCRn) must not be changed to "0". If it is changed, the peripheral function may operate unexpectedly.