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Preliminary User’s Manual U13420EJ2V0UM00
CHAPTER 20 RESET FUNCTION
20.1 Reset Function
The following two operations are available to generate the reset function.
(1) External reset input via RESET pin
(2) Internal reset by watchdog timer runaway time detection
External reset and internal reset have no functional differences. In both cases, program execution starts at the
address at 0000H and 0001H by RESET input. When a low level is input to the RESET pin or the watchdog timer
overflows, a reset is applied and each hardware is set to the status shown in Table 20-1. Each pin has high impedance
during reset input or during oscillation stabilization time just after reset clear.
When a high level is input to the RESET pin, the reset is cleared and program execution starts after the lapse of
oscillation stabilization time 2
17
/f
X
. The reset applied by watchdog timer overflow is automatically cleared after a reset
and program execution starts after the lapse of oscillation stabilization time 2
17
/f
X
(see Figures 20-2 to 20-4).
Cautions 1. For an external reset, input a low level for 10
µ
s or more to the RESET pin.
2. During reset input, main system clock oscillation remains stopped but subsystem clock
oscillation continues.
3. When the STOP mode is cleared by reset, the STOP mode contents are held during reset input.
However, the port pin becomes high-impedance.
Figure 20-1. Reset Function Block Diagram
RESET
Count clock
Reset Control Circuit
Watchdog Timer
Stop
Overflow
Reset signal
Interrupt function
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