HD64F3048F16 Datasheet, PDF (216/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 7 Refresh Controller
Operation in Power-Down State
The refresh controller operates in sleep mode. It does not operate in hardware standby mode. In
software standby mode RTCNT is initialized, but RFSHCR, RTMCSR bits 5 to 3, and RTCOR
retain their settings prior to the transition to software standby mode.
Example
Pseudo-static RAM may have separate OE and RFSH pins, or these may be combined into a single
OE/RFSH pin. Figure 7.17 shows an example of a circuit for generating an OE/RFSH signal.
Check the device characteristics carefully, and design a circuit that fits them. Figure 7.18 shows a
setup procedure to be followed by a program.
H8/3048B Group
RD
RFSH
PSRAM
OE/RFSH
Figure 7.17 Interconnection to Pseudo-Static RAM with OE/RFSH Signal (Example)
Rev. 3.00 Sep 27, 2006 page 188 of 872
REJ09B0325-0300