tmp89fm82t TOSHIBA Semiconductor CORPORATION, tmp89fm82t Datasheet - Page 50

• Manufacturer Part Number: tmp89fm82t
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.3
System clock controller
RA000
Figure 2-10 Level-sensitive Release Mode (Example when the high-frequency clock oscillation
Figure 2-11 Edge-sensitive Release Mode (Example when the high-frequency clock oscillation
STOP pin
XOUT pin
Note:
Note:
Note:
Note:
STOP pin
XOUT pin
NORMAL mode
When the STOP mode is released, the warm-up counter source clock automatically changes to the clock that
generated the main system clock when the STOP mode was started, regardless of WUCCR<WUCSEL>.
Even if the STOP pin input returns to low after the warm-up starts, the STOP mode is not restarted.
When the STOP mode is released, the warm-up counter source clock automatically changes to the clock that
generated the main system clock when the STOP mode was started, regardless of WUCCR<WUCSEL>.
NORMAL mode
If the rising edge is input to the STOP pin within 1 machine cycle after SYSCR1<STOP> is set to "1", the STOP
mode will not be released.
The STOP mode
is started
by the program.
Example: Starting the STOP mode from the NORMAL mode
LD
LD
DI
LD
(Warm-up time at release of the STOP mode is about 200μs at fc=8 MHz.)
2. Release by the key-on wakeup
(WUCCR),0x01
(WUCDR),0x19
(SYSCR1) , 0x80
- Edge-sensitive release mode
periodic intervals. This periodic signal (for example, a clock from a low-power con-
sumption oscillator) is input to the STOP pin. In the edge-sensitive release mode, the
STOP mode is started even when the STOP pin input is high
In this mode, the STOP mode is released at the rising edge of the STOP pin input.
Setting SYSCR1<RELM> to "0" selects the edge-sensitive release mode.
This is used in applications where a relatively short program is executed repeatedly at
Confirm by program that
the STOP pin input is low
and start the STOP mode.
STOP
STOP
mode
circuit is selected)
circuit is selected)
mode
Page 34
V IH
The STOP mode is released by the hardware
at the rising edge of the STOP pin input.
Warm-up
;WUCCR<WUCDIV> = 00 (No division) (Note)
;Sets the warm-up time
;200μs / 8μs = 25 → 0x19
;IMF = 0
;Starts the STOP mode with the edge-sensitive release mode selected
V IH
The STOP mode is released by the hardware.
Always released if the
STOP pin input is high.
Warm-up
NORMAL
mode
STOP
NORMAL mode
TMP89FM82T
mode