UPD78F1502AGK-GAK-AX Datasheet, PDF (229/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 5 CLOCK GENERATOR
Figure 5-4. Format of Oscillation Stabilization Time Counter Status Register (OSTC)
Address: FFFA2H After reset: 00H R
Symbol
7
6
5
4
3
2
1
0
OSTC
MOST MOST MOST MOST MOST MOST MOST MOST
8
9
10
11
13
15
17
18
MOST MOST MOST MOST MOST MOST MOST MOST
8
9
10
11
13
15
17
18
Oscillation stabilization time status
fX = 10 MHz fX = 20 MHz
0
0
0
0
0
0
0
0 2⁸/fX max. 25.6 μs max. 12.8 μs max.
1
0
0
0
0
0
0
0 2⁸/fX min. 25.6 μs min. 12.8 μs min.
1
1
0
0
0
0
0
0 2⁹/fX min. 51.2 μs min. 25.6 μs min.
1
1
1
0
0
0
0
0 2¹⁰/fX min. 102.4 μs min. 51.2 μs min.
1
1
1
1
0
0
0
0 2¹¹/fX min. 204.8 μs min. 102.4 μs min.
1
1
1
1
1
0
0
0 2¹³/fX min. 819.2 μs min. 409.6 μs min.
1
1
1
1
1
1
0
0 2¹⁵/fX min. 3.27 ms min. 1.64 ms min.
1
1
1
1
1
1
1
0 2¹⁷/fX min. 13.11 ms min. 6.55 ms min.
1
1
1
1
1
1
1
1 2¹⁸/fX min. 26.21 ms min. 13.11 ms min.
Cautions 1. After the above time has elapsed, the bits are set to 1 in order from MOST8 and
remain 1.
2. The oscillation stabilization time counter counts up to the oscillation stabilization
time set by OSTS.
In the following cases, set the oscillation stabilization time of OSTS to the value
greater than the count value which is to be checked by the OSTC register after the
oscillation starts.
• If the X1 clock starts oscillation while the internal high-speed oscillation clock or
subsystem clock is being used as the CPU clock.
• If the STOP mode is entered and then released while the internal high-speed
oscillation clock is being used as the CPU clock with the X1 clock oscillating.
(Note, therefore, that only the status up to the oscillation stabilization time set by
OSTS is set to OSTC after the STOP mode is released.)
3. The X1 clock oscillation stabilization wait time does not include the time until clock
oscillation starts (“a” below).
STOP mode release
X1 pin voltage
waveform
a
Remark fX: X1 clock oscillation frequency
R01UH0004EJ0501 Rev.5.01
213
Jun 20, 2011