Clock Supply Setting Function; The Output Function Of A Clock In The Terminal; Prescaler Clock - Toshiba TXZ+ Series Reference Manual

1.2.7. Clock supply setting function

This MCU has the clock on/off function for the peripheral circuits. To reduce the power consumption, this CPU
can stop supplying the clock to the peripheral functions that are not used.
Except some peripheral functions, clocks are not supplied after reset.
In order to supply the clock of the function to be used, set the bit of relevance of [CGFSYSENA],
[CGFSYSENB], [CGFSYSMENB] and [CGSPCLKEN] to "1".
For details, refer to "1.5. Explanation of register".

1.2.8. The output function of a clock in the terminal

This MCU has the clock output function to the terminal. A low speed clock "fs", high speed oscillation clock
"f ", high speed clock "fc", system clock "fsys" can be output from the SCOUT pin.
OSC
For details, refer to "1.4.2.5. [CGSCOCR] (SCOUT Output control register)".
The below table shows the use propriety state of SCOUT pin in each operation mode.
SCOUT selection
f
OSC
fc
fs
fsys

1.2.9. Prescaler clock

Each peripheral function has a Prescaler circuit to divide the ΦT0 clock. The ΦT0 clock inputted into the prescaler
circuit can be divided by the [CGSYSCR]<PRCK[3:0]>. As for ΦT0 clock after reset, fc is selected.
After register writing before a clock actually changes, a time up to 512-clock of fc is required. To confirm the
completion of the clock changed, check the status of [CGSYSCR]<PRCKST[3:0]>.
Note: Do not change a prescaler clock during operation of peripheral functions, such as a timer counter.
Table 1.5 List of Use propriety in each operation mode
NORMAL/IDLE
Yes
Yes
Yes
Yes
Clock Control and Operation Mode
Operation mode
STOP1
N/A
N/A
Yes
N/A
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TXZ+ Family
TMPM3H Group(1)
STOP2
N/A
N/A
N/A
N/A
2022-05-10
Rev. 1.3