UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 638

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

21.3 PSEUDO-STATIC RAM REFRESH FUNCTION
is specified by the refresh mode register (RFM) setting.
the same time as memory access operations. This enables bus cycle insertions for refresh operations to be greatly
decreased, thus minimizing the reduction in performance due to refresh operations.
a pseudo-static RAM application system.
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The PD784026 incorporates a pseudo-static RAM refresh function for direct connection of pseudo-static RAM.
The pseudo-static RAM refresh function outputs refresh pulses at any desired intervals. The refresh pulse output interval
The refresh area specification register (RFA) specifies the addresses on which refresh operations can be performed at
The PD784026 is provided with a function for supporting self-refresh operations that offers low power consumption by
Cautions 1.
2. The pseudo-static RAM refresh function does not operate normally with an in-circuit emulator. For
The refresh function cannot be used when the bus hold function is used.
details, refer to 21.5 CAUTIONS.
CHAPTER 21 LOCAL BUS INTERFACE FUNCTION