Warming Up Function; The Warming Up Timer For A High Speed Oscillation - Toshiba TXZ+ Series Reference Manual
32-bit risc microcontroller, clock control and operation mode cg-m4g(1)-c
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Warming up function
A warming up function starts the warming up timer for high speed oscillator automatically to secure the oscillation
stable time when the STOP1 mode is released.
It is also available as a count-up timer which uses the warming up timer for high speed oscillator to secure the
stability of an external oscillator or an internal oscillator.
This chapter explains the setting method to the register for warming up timers, and the case where it is used as a
count-up timer. The detailed explanation at the time of STOP1 mode release, refer to "1.3.3.2 Warming up at the
release of Low Power Consumption mode".
The warming up timer for a high speed oscillation
A 16-bit up-counter is built in as a warming up timer only for a high speed oscillation. Also when setting it before
changes to the STOP1 mode, calculate with the following formula and set [CGWUPHCR]<WUPT[15:4]> to the
upper 12 bits of the result. Lower 4bits are ignored.
<Formula>
(Using external high speed oscillator)
Warming up timer setting value (16 bits)
= (warming up time (s) / clock period (s)) - 16
(Example) When 5ms of warming up time is set up with 10 MHz (100 ns of clock periods) of oscillator
Warming up timer setting value (16 bits)
Since upper 12 bits are used, set the register as follows.
[CGWUPHCR]<WUPT[15:4]> = 0xC34
(Using internal high speed oscillator1)
Warming up timer setting value (16 bits)
= (warming up time (s) -63.3μs ) / clock period (s)) - 41
(Example) When 163.4μs of warming time is set up with 10 MHz (100 ns of clock periods) of oscillator
Warming up timer setting value (16 bits)
Since upper 12 bits are used, set the register as follows.
[CGWUPHCR]<WUPT[15:4]> = 0x03C
Setting range is 0x03C ≤ <WUPT[15:4]> ≤ 0xFFF, Warming up time is set from 163.4 μs to 6.6194 ms.
Clock Control and Operation Mode
= (5ms / 100ns) - 16
= 50000 - 16
= 49984
= 0xC340
= ((163.4μs – 63.3μs) / 100ns) - 41
= (100.1μs / 100ns) - 41
= 960
= 0x03C0
14 / 88
TXZ+ Family
TMPM4G Group(1)
2021-06-30
Rev. 1.1
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