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| 型号： | TMP86C847UG |
| 厂商： | Toshiba Corporation |
| 英文描述： | Zener Diode; Application: General; Pd (mW): 500; Vz (V): 15.7 to 16.5; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35 |
| 中文描述： | 8位微控制器 |
| 文件页数： | 26/160页 |
| 文件大小： | 1541K |
| 代理商： | TMP86C847UG |
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Page 18
2. Operational Description
2.2 System Clock Controller
TMP86C847UG
Figure 2-8 Edge-sensitive Release Mode
STOP mode is released by the following sequence.
1. In the dual-clock mode, when returning to NORMAL2, both the high-frequency and low-
frequency clock oscillators are turned on; when returning to SLOW1 mode, only the low-
frequency clock oscillator is turned on. In the single-clock mode, only the high-frequency
clock oscillator is turned on.
2. A warm-up period is inserted to allow oscillation time to stabilize. During warm up, all
internal operations remain halted. Six different warm-up times can be selected with the
SYSCR1<WUT> in accordance with the resonator characteristics.
3. When the warm-up time has elapsed, normal operation resumes with the instruction follow-
ing the STOP mode start instruction.
Note 1: When the STOP mode is released, the start is made after the prescaler and the divider of the
timing generator are cleared to "0".
Note 2: STOP mode can also be released by inputting low level on the
RESET
pin, which immediately
performs the normal reset operation.
Note 3: When STOP mode is released with a low hold voltage, the following cautions must be observed.
The power supply voltage must be at the operating voltage level before releasing STOP mode.
The
RESET
pin input must also be “H” level, rising together with the power supply voltage. In this
case, if an external time constant circuit has been connected, the
RESET
pin input voltage will
increase at a slower pace than the power supply voltage. At this time, there is a danger that a
reset may occur if input voltage level of the
RESET
pin drops below the non-inverting high-level
input voltage (Hysteresis input).
Note 1: The warm-up time is obtained by dividing the basic clock by the divider. Therefore, the warm-up
time may include a certain amount of error if there is any fluctuation of the oscillation frequency
when STOP mode is released. Thus, the warm-up time must be considered as an approximate
value.
Table 2-2 Warm-up Time Example (at fc = 16.0 MHz, fs = 32.768 kHz)
WUT
Warm-up Time [ms]
Return to NORMAL Mode
Return to SLOW Mode
000
010
100
110
*01
*11
12.288
4.096
3.072
1.024
0.192
0.064
750
250
5.85
1.95
5.9
2.0
NORMAL
operation
NORMAL
operation
V
IH
STOP mode is released by the hardware at the rising
edge of STOP pin input.
Warm up
STOP mode started
by the program.
STOP
operation
STOP
operation
STOP pin
XOUT pin
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