upd78f0124m6gba1-8et Renesas Electronics Corporation., upd78f0124m6gba1-8et Datasheet - Page 111

• Manufacturer Part Number: upd78f0124m6gba1-8et
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(6) Oscillation stabilization time select register (OSTS)
This register is used to select the X1 oscillation stabilization wait time when STOP mode is released.
The wait time set by OSTS is valid only after STOP mode is released with the X1 input clock selected as CPU
clock. After STOP mode is released with the internal oscillation clock selected as CPU clock, the oscillation
stabilization time must be confirmed by OSTC.
OSTS can be set by an 8-bit memory manipulation instruction.
RESET input sets OSTS to 05H.
Address: FFA4H
Symbol
OSTS
Remark f
Note Expanded-specification products of standard products and (A) grade products only
Cautions 1. To set the STOP mode while the X1 input clock is used as the CPU clock, set
Figure 5-7. Format of Oscillation Stabilization Time Select Register (OSTS)
OSTS2
7
0
0
0
0
1
1
After reset: 05H
Other than above
2. Before setting OSTS, confirm with OSTC that the desired oscillation stabilization
3. If the STOP mode is entered and then released while the internal oscillation
4. The wait time when STOP mode is released does not include the time after STOP
XP
: X1 input clock oscillation frequency
OSTS before executing the STOP instruction.
time has elapsed.
clock is 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.
OSTS1
6
0
0
1
1
0
0
• Desired OSTC oscillation stabilization time ≤ Oscillation stabilization time
X1 pin voltage
waveform
set by OSTS
R/W
CHAPTER 5 CLOCK GENERATOR
OSTS0
User’s Manual U16315EJ3V1UD
5
0
1
0
1
0
1
STOP mode release
2
2
2
2
2
Setting prohibited
11
13
14
15
16
/f
/f
/f
/f
/f
XP
XP
XP
XP
XP
4
0
a
Oscillation stabilization time selection
3
0
204.8
819.2
1.64 ms
3.27 ms
6.55 ms
When f
µ
µ
s
s
OSTS2
XP
= 10 MHz
2
OSTS1
When f
170.7
682.7
1.37 ms
2.73 ms
5.46 ms
1
µ
µ
XP
s
s
= 12 MHz
OSTS0
0
Note
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