upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 90

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(6) Oscillation stabilization time counter status register (OSTC)
90
This is the register that indicates the count status of the X1 clock oscillation stabilization time counter. When X1
clock oscillation starts with the internal high-speed oscillation clock used as the CPU clock, the X1 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, and WDT), the STOP instruction and MSTOP (bit 7 of
MOC register) = 1 clear OSTC to 00H.
Address: FFA3H
Symbol
OSTC
Figure 5-7. Format of Oscillation Stabilization Time Counter Status Register (OSTC)
Remark f
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
2. The oscillation stabilization time counter counts up to the oscillation
3. The X1 clock oscillation stabilization wait time does not include the time until
X
: X1 clock oscillation frequency
MOST13
remain 1.
stabilization time set by OSTS. If the STOP mode is entered and then released
while the internal high-speed oscillation clock is being used as the CPU clock,
set the oscillation stabilization time as follows.
Note, therefore, that only the status up to the oscillation stabilization time set by
OSTS is set to OSTC after STOP mode is released.
clock oscillation starts (“a” below).
6
0
0
1
1
1
1
• Desired OSTC oscillation stabilization time ≤ Oscillation stabilization time
X1 pin voltage
waveform
set by OSTS
R
Preliminary User’s Manual U19014EJ1V0UD
CHAPTER 5 CLOCK GENERATOR
MOST14
5
0
0
0
1
1
1
STOP mode release
MOST11
MOST15
4
0
0
0
1
1
a
MOST13
MOST16
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
X
X
X
X
X
2
min.
min.
min.
min.
min.
170.7
682.7
1.37 ms min. 1.024 ms min.
2.73 ms min. 2.048 ms min.
5.46 ms min. 4.096 ms min.
f
X
MOST15
= 12 MHz
1
µ
µ
s min. 128
s min. 512
f
X
MOST16
= 16 MHz
µ
µ
0
s min.
s min.