UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 68

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

CHAPTER 2 PIN FUNCTIONS
Caution In the PD78233 and 78237, the TEST pin is the MODE pin and is fixed high. When changing over from
the PD78233, 78237, the circuitry can be modified so that this pin is directly connected to V
.
SS
Any modification is needed if the PD78234, 78238 was used with switching between the internal ROM
mode and ROM-less mode performed by MODE pin switching (the TEST pin must be directly connected
to V
).
SS
Modification examples:
• Incorporate all programs in ROM.
• Store all programs in external ROM.
• Change the location address of a program previously held in external ROM, shift the address to avoid
overlapping internal ROM, and execute this program from the program internal ROM.
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