UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 681

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

23.1 RESET FUNCTION
states shown in Table 23-2, and all pins except the power supply pins and the X1 and X2 pins are placed in the high-
impedance state. Table 23-1 shows the pin statuses on reset and after reset release.
the reset vector table are set in bits 0 to 7 of the program counter (PC), the contents of address 00001H in bits 8 to 15,
and 0000B in bits 16 to 19, a branch is made, and program execution is started at the branch destination address. A reset
start can therefore be performed from any address in the base area.
Figure 23-1).
When low level is input to the RESET input pin, a system reset is affected, the various hardware units are set to the
When the RESET input changes from low to high level, the reset state is released, the contents of address 00000H of
The contents of the various registers should be initialized as required in the program in the base area.
To prevent misoperation due to noise, the RESET input pin incorporates an analog delay noise elimination circuit (see
Internal Reset Signal
RESET
(Input)
Delay
Figure 23-1 Reset Signal Acknowledgment
CHAPTER 23 RESET FUNCTION
Delay
Reset Start
Delay PC Initialization, etc.
Reset End
Execution of Instruction
at Reset Start Address
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