upd78f0114m6gb-8es Renesas Electronics Corporation., upd78f0114m6gb-8es Datasheet - Page 339

• Manufacturer Part Number: upd78f0114m6gb-8es
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) 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.
Reset release (reset by RESET input, POC, LVI, clock monitor, and WDT), the STOP instruction, MSTOP (bit 7 of
MOC register) = 1, and MCC (bit 7 of PCC register) = 1 clear OSTC to 00H.
Address: FFA3H
Symbol
OSTC
Figure 17-1. Format of Oscillation Stabilization Time Counter Status Register (OSTC)
Note Expanded-specification products of standard products and (A) grade products only
Cautions 1. After the above time has elapsed, the bits are set to 1 in order from MOST11 and
Remark f
MOST11
7
0
1
1
1
1
1
After reset: 00H
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
XP
MOST13
: X1 input clock oscillation frequency
remain 1.
being used as the CPU clock, set the oscillation stabilization time as follows.
The X1 oscillation stabilization time counter counts only during the oscillation
stabilization time set by OSTS. Therefore, note that only the statuses during the
oscillation stabilization time set by OSTS are set to OSTC after STOP mode has
been released.
STOP mode release until clock oscillation starts (“a” below) regardless of
whether STOP mode is released by RESET input or interrupt generation.
• Desired OSTC oscillation stabilization time ≤ Oscillation stabilization time
6
0
0
1
1
1
1
set by OSTS
X1 pin voltage
waveform
CHAPTER 17 STANDBY FUNCTION
MOST14
R
5
0
0
0
1
1
1
User’s Manual U16227EJ3V0UD
STOP mode release
MOST15
MOST11
4
0
0
0
1
1
a
MOST13
MOST16
3
0
0
0
0
1
2
2
2
2
2
11
13
14
15
16
MOST14
/f
/f
/f
/f
/f
XP
XP
XP
XP
XP
Oscillation stabilization time status
2
min.
min.
min.
min.
min.
204.8
819.2
1.64 ms min. 1.37 ms min.
3.27 ms min. 2.73 ms min.
6.55 ms min. 5.46 ms min.
When f
10 MHz
MOST15
1
µ
µ
s min. 170.7
s min. 682.7
XP
=
When f
12 MHz
MOST16
0
µ
µ
s min.
s min.
XP
Note
=
339