SH7619 Datasheet, PDF (180/836 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7619 Series

Section 7 Bus State Controller (BSC)
7.4.7 Refresh Time Constant Register (RTCOR)
RTCOR is an 8-bit register. When RTCOR matches RTCNT, the CMF bit in RTCSR is set to 1
and RTCNT is cleared to 0. When the RFSH bit in SDCR is 1, a memory refresh request is issued.
The request is maintained until the refresh operation is performed. If the request is not processed
when the next matching occurs, the previous request is ignored.
When the RTCOR is written to, the upper 16 bits of the write data must be H'A55A to cancel write
protection.
Bit
31 to 8
Initial
Bit Name Value R/W

All 0 R
7 to 0 
All 0 R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
8-bit Counter
Rev. 5.00 Mar. 15, 2007 Page 142 of 794
REJ09B0237-0500