upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 95

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(5) Oscillation stabilization time counter status register (OSTC)
This is the status register of the X1 input clock oscillation stabilization time counter. If the Ring-OSC clock is used
as the CPU clock, the X1 input clock oscillation stabilization time can be checked.
OSTC can be read by a 1-bit or 8-bit memory manipulation instruction.
When reset is released (reset by RESET input, POC, LVI, clock monitor, and WDT), the STOP instruction,
MSTOP = 1 clear OSTC to 00H.
Address: FFA3H
Symbol
OSTC
Figure 5-6. Format of Oscillation Stabilization Time Counter Status Register (OSTC)
Note Expanded-specification products of standard products and (A) grade products only
Remark
Cautions 1. After the above time has elapsed, the bits are set to 1 in order from MOST11 and
MOST11
7
0
1
1
1
1
1
After reset: 00H
f
2. If the STOP mode is entered and then released while the Ring-OSC clock is
3. The wait time when STOP mode is released does not include the time after STOP
XP
: X1 input clock oscillation frequency
MOST13
remain 1.
being used as the CPU clock, set the oscillation stabilization time as follows.
The X1 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.
mode release until clock oscillation starts (“a” below) regardless of whether
STOP mode is released by RESET input or interrupt generation.
6
0
0
1
1
1
1
X1 pin voltage
waveform
Desired OSTC oscillation stabilization time
set by OSTS
R
CHAPTER 5 CLOCK GENERATOR
MOST14
User’s Manual U15836EJ5V0UD
5
0
0
0
1
1
1
STOP mode release
MOST11
MOST15
4
0
0
0
1
1
a
MOST16
MOST13
3
0
0
0
0
1
2
2
2
2
2
MOST14
11
13
14
15
16
Oscillation stabilization time status
/f
/f
/f
/f
/f
XP
XP
XP
XP
XP
2
min.
min.
min.
min.
min.
Oscillation stabilization time
f
XP
204.8 s
min.
819.2 s
min.
1.64 ms
min.
3.27 ms
min.
6.55 ms
min.
MOST15
= 10 MHz f
1
XP
170.7 s
min.
682.7 s
min.
1.37 ms
min.
2.73 ms
min.
5.46 ms
min.
MOST16
= 12 MHz
0
Note
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