upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 421
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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at 0000H and 0001H when the reset signal is generated.
circuit voltage detection, and each item of hardware is set to the status shown in Tables 15-1 and 15-2. Each pin is
high impedance during reset signal generation or during the oscillation stabilization time just after a reset release.
level is input to the RESET pin and program execution is started with the internal high-speed oscillation clock after
reset processing. A reset by the watchdog timer is automatically released, and program execution starts using the
internal high-speed oscillation clock (see Figures 15-2 to 15-4) after reset processing. Reset by POC and LVI circuit
power supply detection is automatically released when V
execution starts using the internal high-speed oscillation clock (see CHAPTER 16 POWER-ON-CLEAR CIRCUIT
and CHAPTER 17 LOW-VOLTAGE DETECTOR) after reset processing.
The following four operations are available to generate a reset signal.
(1) External reset input via RESET pin
(2) Internal reset by watchdog timer program loop detection
(3) Internal reset by comparison of supply voltage and detection voltage of power-on-clear (POC) circuit
(4) Internal reset by comparison of supply voltage and detection voltage of low-power-supply detector (LVI)
External and internal resets have no functional differences. In both cases, program execution starts at the address
A reset is applied when a low level is input to the RESET pin, the watchdog timer overflows, or by POC and LVI
When a low level is input to the RESET pin, the device is reset. It is released from the reset status when a high
Cautions 1. For an external reset, input a low level for 10
2. During reset signal generation, the X1 clock, internal high-speed oscillation clock, and
3. When the STOP mode is released by a reset, the STOP mode contents are held during reset
internal low-speed oscillation clock stop oscillating.
becomes invalid.
input. However, the port pins become high-impedance.
CHAPTER 15 RESET FUNCTION
Preliminary User’s Manual U19014EJ1V0UD
DD
≥ V
µ
s or more to the RESET pin.
POC
or V
DD
External main system clock input
≥ V
LVI
after the reset, and program
421
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