tmp19a61f10xbg TOSHIBA Semiconductor CORPORATION, tmp19a61f10xbg Datasheet - Page 27
tmp19a61f10xbg
Manufacturer Part Number
tmp19a61f10xbg
Description
32-bit Tx System Risc Tx19 Family
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP19A61F10XBG.pdf
(575 pages)
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TMP19A61F10XBG
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5.5 System Clock Controller
5.5.1 Oscillation Stabilization Time (Switching between the NORMAL and STOP modes)
By resetting the system clock controller, the controller status switches to single clock mode and
is initialized to <XEN> = "1 and <GEAR2:0> = “111” and the system clock fsys changes to fc/8.
(fc = fosc (original oscillation frequency) × 4, because the original oscillation is quadrupled by PLL.)
For example, when a 13-MHz oscillator is connected to the X1 or X2 pin, fsys becomes 6.25
MHz (=13.5 × 4 × 1/8) after the reset.
Similarly, when the oscillator is not connected and an external oscillator is used to input a clock
instead, fsys becomes the frequency obtained from the calculation "input frequency × 4 × 1/8."
(Note)Set the system clock frequency to be 4MHz or more as the default.
(Note 1) The time for warm-up is required even when an external clock (oscillator, etc.)
(Note 2) The warm-up timer operates according to the oscillation clock, and it can
The warm-up timer is provided to confirm the oscillation stability of the oscillator when it is
connected to the oscillator connection pin. The warm-up time can be selected by setting the
SYSCR2<WUPT1:0> depending on the characteristics of the oscillator.
Table 5.5.1 shows warm-up time at switching.
contain errors if there is any fluctuation in the oscillation frequency.
Therefore, the warm-up time should be taken as approximate time.
is used and providing stable oscillation because the internal PLL is used
even in this case.
These values are calculated under the following conditions:fosc = 13.5MHz
10 (2
11 (2
SYSCR2<WUPT1 : 0>
01 (2
Warm-up time options
14
16
8
/ oscillating frequency)
/ oscillating frequency)
/ oscillating frequency)
TMP19A61(rev 1.0)-5-26
Table 5.5.1 Warm-up Time
High speed clock
18.963(μs)
1.214(ms)
4.855(ms)
(fosc)
TMP19A61
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