upd78f0114m6gb-8es Renesas Electronics Corporation., upd78f0114m6gb-8es Datasheet - Page 340

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

(2) Oscillation stabilization time select register (OSTS)
340
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 when the X1 input clock is selected as the CPU
clock.
oscillation stabilization time using OSTC.
OSTS can be set by an 8-bit memory manipulation instruction.
RESET input sets OSTS to 05H.
Address: FFA4H
Symbol
OSTS
After STOP mode is released when the Ring-OSC clock is selected as the CPU clock, check the
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 the CPU clock, set OSTS
Remark f
Figure 17-2. Format of Oscillation Stabilization Time Select Register (OSTS)
OSTS2
7
0
0
0
0
1
1
After reset: 05H
Other than above
2. Set OSTS after confirming that the oscillation stabilization time expected by
3. If the STOP mode is entered and then released while the Ring-OSC clock is
4. The wait time when STOP mode is released does not include the time after
XP
: X1 input clock oscillation frequency
OSTS1
before executing the STOP instruction.
OSTS has elapsed.
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
0
0
set by OSTS
X1 pin voltage
waveform
R/W
CHAPTER 17 STANDBY FUNCTION
OSTS0
User’s Manual U16227EJ3V0UD
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