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9.1 Configuration and Operation of Reset Function
Three types of reset signals are used: the external reset signal (RESET), a reset signal from the basic interval
timer/watchdog timer, and a key return reset. When any one of these reset signals is input, the internal reset signal
is asserted. Figure 9-1 shows the configuration of the reset circuit.
RESET
KRREN
V
DD
Mask option
P70/KR4
P71/KR5
P72/KR6
P73/KR7
When the RESET signal is generated, each hardware unit is initialized as shown in Table 9-1. Figure 9-2 shows
the timing of the reset operation.
CHAPTER 9 RESET FUNCTION
Figure 9-1. Configuration of Reset Circuit
V
DD
Mask option
Q
R
S
One-shot pulse generator
Falling edge detector
User's Manual U10676EJ3V0UM
S
Q
R
Instruction
S
Q
R
Instruction
STOP mode
Interrupt
Internal reset signal
Watchdog timer overflow
WDF
KRF
227
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