tmp88fw45afg TOSHIBA Semiconductor CORPORATION, tmp88fw45afg Datasheet - Page 32

• Manufacturer Part Number: tmp88fw45afg
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.1
Functions of the CPU Core
the device is immediately reset as is normally reset by RESET. After reset, the device starts operating
from NORMAL mode.
The device is released from STOP mode following the sequence described below.
The device can also be released from STOP mode by pulling the RESET pin input low, in which case
Note:Because the warm-up time is obtained from the fundamental clock by dividing it, if the oscillation
Note:When exiting STOP mode while the device is retained at low voltage, the following caution is
1. Only the high-frequency oscillator is oscillating.
2. A warm-up time is inserted in order to allow for the clock oscillation to stabilize. During warm-
3. After an elapse of the warm-up time, the device restarts normal operation beginning with the
frequency fluctuates while exiting STOP mode, the warm-up time becomes to have some error.
Therefore, the warm-up time must be handled as an approximate value.
required.
Before exiting STOP mode, the power supply voltage must be raised to the operating voltage.
At this time, the RESET pin level also is high and rises along with the power supply voltage. If
the device has a time-constant circuit added external to the chip, the voltage on RESET pin input
does not rise as fast as the power supply voltage. Therefore, if the voltage level on RESET pin
input is below the RESET pin’s noninverted, high-level input voltage (hysteresis input), the device
may be reset.
up, the internal circuits remain idle. The warm-up time can be selected from three choices
according to the oscillator characteristics by using SYSCR1<WUT>.
instruction next to one that placed it in STOP mode. At this time, the prescaler and divider for
the timing generator start from the zero-cleared state.
Table 2-2 Warm-up Time (Example: fc = 20 MHz)
WUT
00
01
10
11
DV1CK = 0
Reserved
When Returning to NORMAL Mode
9.831
3.277
0.819
Page 18
Warm-up Time [ms]
DV1CK = 1
Reserved
19.662
6.554
1.638
TMP88FW45AFG