CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U16846EJ1V0UD
88
Figure 5-6. Format of Oscillation Stabilization Time Counter Status Register (OSTC)
Address: FFA3H After reset: 00H R
Symbol
7 6 5 4 3 2 1 0
OSTC 0
0
0
MOST11
MOST13 MOST14 MOST15 MOST16
Oscillation stabilization time status
MOST11 MOST13 MOST14 MOST15 MOST16
f
XP
= 10 MHz f
XP
= 16 MHz
1 0 0 0 0
2
11
/f
XP
min. 204.8
µ
s min. 128
µ
s min.
1 1 0 0 0
2
13
/f
XP
min. 819.2
µ
s min. 512
µ
s min.
1 1 1 0 0
2
14
/f
XP
min. 1.64 ms min. 1.02 ms min.
1 1 1 1 0
2
15
/f
XP
min. 3.27 ms min. 2.04 ms min.
1 1 1 1 1
2
16
/f
XP
min. 6.55 ms min. 4.09 ms min.
Cautions 1. After the above time has elapsed, the bits are set to 1 in order from MOST11 and
remain 1.
2. If the STOP mode is entered and then released while the Ring-OSC clock is
being used as the CPU clock, set the oscillation stabilization time as follows.
•
Desired OSTC oscillation stabilization time
≤
Oscillation stabilization time
set by OSTS
The oscillation stabilization time counter counts up to the oscillation
stabilization time set by OSTS. Note, therefore, that only the status up to the
oscillation stabilization time set by OSTS is set to OSTC after STOP mode is
released.
3. The wait time when STOP mode is released does not include the time after STOP
mode release until clock oscillation starts (“a” below) regardless of whether
STOP mode is released by RESET input or interrupt generation.
STOP mode release
X1 pin voltage
waveform
a
Remark f
XP
: High-speed system clock oscillation frequency